The American Mathematical Monthly, Volume 112

Volume 112, Number 1, January 2005

• 
  William Dunham:
  Touring the Calculus Gallery. 1-19
• 
  Marcel Wild:
  The Groups of Order Sixteen Made Easy. 20-31
• 
  Shif Berhanu, Ahmed Mohammed:
  A Harnack Inequality for Ordinary Differential Equations. 32-41
• 
  Janko Hernández, Leonel Robert:
  Figures of Constant Width on a Chessboard. 42-50
• 
  H. S. Bear, Dale Myers:
  A Simpler Approach to Integration and the Fubini Theorem. 51-60

Notes

• 
  Jonathan Sondow:
  Double Integrals for Euler's Constant and in and an Analog of Hadjicostas's Formula. 61-65
• 
  Dan Romik:
  Roots of the Derivative of a Polynomial. 66-69
• 
  Joel L. Weiner, George R. Wilkens:
  Quaternions and Rotations in. 69-76
• 
  José Carlos de Sousa, Oliveira Santos:
  Another Proof of the Fundamental Theorem of Algebra. 76-78

The Evolution of ...

• 
  V. F. Kagan:
  Riemann's Geometric Ideas. 79-86

Problems and solutions

• 
  Bogdan Nica:
  Problem 11124. 87
• 
  Shahin Amrahov:
  Problem 11125. 87
• 
  James S. Weber:
  Problem 11126. 87
• 
  Li Zhou:
  Problem 11127. 87
• 
  Tom M. Apostol:
  Problem 11128. 88
• 
  Yongge Tian:
  Problem 11129. 88
• 
  Paul Bateman:
  Problem 11130. 88

Solutions

• 
  Wu Wei Chao, O. P. Lossers:
  Point Causing Equal Angles: 10996. 88
• 
  Victor Pambuccian, Michael Wolterman:
  Saccheri Quadrilateral: 11004. 88-89
• 
  Marty Getz, Dixon Jones, Ken Dutch:
  Partitioning by Arithmetic Progressions: 11005. 89-90
• 
  Bogdan Suceava, Daniele Donini:
  A Circle Centered on the Euler Circle: 11006. 90-91
• 
  José Luis Díaz-Barrero, Juan José Egozcue, Arturas Dubickas:
  Zero and Coefficient Inequality: 11008. 91-92
• 
  David Borwein, Julien Grivaux:
  Convex and Concave Functions: 11009. 92-93
• 
  Erwin Just, Norman Schaumberger, et al.:
  Regular Polygon Inscription: 11010. 93-94

Reviews

• 
  Steve Kennedy:
  Turing: A Novel About Computation by Christos H. Papadimitriou. 95-98
• 
  Marion Deutsche Cohen:
  The Magic of Numbers by Benedict Gross; Joe Harris. 98-101

Volume 112, Number 2, February 2005

• 
  Gregory S. Warrington:
  Juggling Probabilities. 105-118
• 
  Alex D. D. Craik:
  Prehistory of Faà di Bruno's Formula. 119-130
• 
  Paolo Codecà, Mohan Nair:
  The Lesser-Known Δ-Function in Number Theory. 131-140
• 
  Juan Carlos Álvarez Paiva, Anthony Thompson:
  On the Perimeter and Area of the Unit Disc. 141-154
• 
  Ian Doust, Michael D. Hirschhorn, Jocelyn Ho:
  Trigonometric Identities, Linear Algebra, and Computer Algebra. 155-164

Notes

• 
  Connie Maude Campbell, William Staton:
  A Square-Packing Problem of Erdős. 165-167
• 
  Laurentiu Panaitopol:
  On the Representation of Natural Numbers as Sums of Squares. 168-171
• 
  Jiu Ding, Temple H. Fay:
  The Perron-Frobenius Theorem and Limits in Geometry. 171-175
• 
  Piotr Hajlasz, Pawel Strzelecki:
  How to Measure Volume with a Thread. 176-179

Problems and Solutions

• 
  N. G. de Bruijn:
  Problem 11131. 180
• 
  Jonathan Sondow:
  Problem 11132. 180
• 
  Paul Bracken:
  Problem 11133. 180
• 
  Kent D. Boklan:
  Problem 11134. 180
• 
  Ray Redheffer:
  Problem 11135. 181
• 
  Raymond Mortini:
  Problem 11136. 181
• 
  Vicentiu D. Radulescu:
  Problem 11137. 181

Solutions

• 
  Donald P. Minassian:
  Baire Class One: 10999. 181-182
• 
  George Lamb, Zafar Ahmed:
  An Application of the Gaussian Integral: 11011. 182-183
• 
  Calin Popescu, Chu Wenchang:
  Cube Sum Inequalities: 11012. 183-184
• 
  David Callan, Marc Renault:
  Dyck Paths Skipping Every Fourth Point: 11013. 184
• 
  Achilleas Sinefakopoulos, Knut Dale:
  A Recursively Defined Series: 11014. 184-185
• 
  Ovidiu Furdui, Li Zhou:
  Sines in a Triangle: 11015. 185-186
• 
  C. R. Pranesachar, Saïd Amghibech:
  When the Brocard Points Are Collinear with a Vertex: 11017. 186-187

Reviews

• 
  Eric S. Weber:
  An Introduction to Frames and Riesz Bases by Ole Christensen. 188-191
• 
  Jeffrey Nunemacher:
  Geometry by David A. Brannan; Matthew F. Esplen; Jeremy J. Gray. 191-194

Volume 112, Number 3, March 2005

• 
  Robert E. Megginson:
  Yueh-Gin Gung and Dr. Charles Y. Hu Award to Gerald L. Alexanderson for Distinguished Service to Mathematics. 197-199
• 
  Roger C. Alperin:
  Trisections and Totally Real Origami. 200-211
• 
  John Bryk, Cesar E. Silva:
  Measurable Dynamics of Simple p-adic Polynomials. 212-232
• 
  Ivor Grattan-Guinness:
  The "Ecole Polytechnique", 1794-1850: Differences over Educational Purpose and Teaching Practice. 233-250
• 
  William Duke, Kimberly Hopkins:
  Quadratic Reciprocity in a Finite Group. 251-256

Footnotes

• 
  Shay Gueron, Itai Shafrir:
  A Weighted Erdős-Mordell Inequality for Polygons. 257-263
• 
  Luo Xuebo, Zhu-Jun Zheng:
  An Inequality for Homogeneous Polynomials on. 264-266
• 
  Peter G. Anderson, Arthur T. Benjamin, Jeremy A. Rouse:
  Combinatorial Proofs of Fermat's, Lucas's, and Wilson's Theorems. 266-268
• 
  Kurt Girstmair:
  On an Irreducibility Criterion of M. Ram Murty. 269-270
• 
  Robert J. MacG. Dawson:
  On a "Singular" Integration Technique of Poisson. 270-272

Problems and Solutions

• 
  Roberto Tauraso:
  Problem 11138. 273
• 
  Grahame Bennett:
  Problem 11139. 273
• 
  Walther Janous:
  Problem 11140. 273
• 
  Richard Bagby:
  Problem 11141. 273
• 
  Donald E. Knuth:
  Problem 11142. 273-274
• 
  Alexander Dubinov, Irina Dubinova:
  Problem 11143. 274
• 
  Ernst Schulte-Geers:
  Problem 11144. 274
• 
  Joel Zinn:
  Problem 11076. 274
• 
  Bob Berk, Larry Shepp:
  Problem 11120. 274
• 
  Arturas Dubickas:
  Problem 11123. 274

Solutions

• 
  Slavko Simic, Richard Stong:
  Entire Functions of Order Zero: 11018. 274-277
• 
  Bernardo Recamán Santos, Michail Reid, Kevin Ford:
  Cycling via Common Divisors: 11019. 277-278
• 
  Donald E. Knuth, Silvia Fernández, Gerry Myerson:
  A Modular Triple: 11021. 279-280
• 
  Razvan A. Satnoianu, Walther Janous:
  A Two-Triangle Inequality: 11022. 280
• 
  Wu Wei Chao, Nadjib Bouzar, Allan K. Swett:
  A Timely Problem: 11023. 280

Reviews

• 
  Gerald B. Folland, Jeffrey L. Stuart:
  Linear Algebra by John B. Fraleigh; Raymond A. Beauregard; Linear Algebra and its Applications by David Lay; Linear Algebra: A Geometric Approach by Theodore Shifrin; Malcolm R. Adams; Introduction to Linear Algebra by Gilbert Strang. 281-288

Volume 112, Number 4, April 2005

• 
  Don Shimamoto, Catherine Vanderwaart:
  Spaces of Polygons in the Plane and Morse Theory. 289-310
• 
  Edward B. Burger:
  A Tail of Two Palindromes. 311-321
• 
  Sherman Stein:
  Remarks on the Gravity Equation. 322-333
• 
  Christopher S. Simons:
  An Elementary Approach to the Monster. 334-341
• 
  Daniel J. Velleman:
  The Generalized Simpson's Rule. 342-350

Notes

• 
  Boris Mirman:
  Sufficient Conditions for Poncelet Polygons Not to Close. 351-356
• 
  Jürgen Kindler:
  A Simple Proof of Sion's Minimax Theorem. 356-358
• 
  John Clifford, David James, Michael A. Lachance, Joan Remski:
  A Constructive Approach to Singular Value Decomposition and Symmetric Schur Factorization. 358-363
• 
  Marco Dall'Aglio, Fabio Maccheroni:
  Fair Division without Additivity. 363-365

Problems and Solutions

• 
  Joel Zinn:
  Problem 11145. 366
• 
  Yongge Tian:
  Problem 11146. 366
• 
  Pamela Gorkin:
  Problem 11147. 366
• 
  M. L. Glasser:
  Problem 11148. 366
• 
  Mircea Ivan, Ioan Rasa:
  Problem 11149. 367
• 
  Emeric Deutsch:
  Problem 11150. 367
• 
  Donald E. Knuth:
  Problem 11151. 367

Solutions

• 
  Jonathan Sondow, Richard Stong, Julien Grivaux:
  An Identity Involving Harmonic Numbers: 11026. 367-369
• 
  H. Reuvers, Li Zhou, A. Engle:
  Triangles Inscribed in a Circle: 11027. 369-370
• 
  Götz Trenkler, Gary P. Shannon:
  Hermitian Products of Hermitian Matrices: 11028. 370-371
• 
  Steven Butler, Bruce R. Ebanks:
  A Functional Equation: 11030. 371-372
• 
  Li Zhou, Robin Chapman:
  Monster Mean Tamed: 11031. 372-373

Reviews

• 
  David E. Rowe:
  Mathematicians under the Nazis by Sanford L. Segal. 374-381

Volume 112, Number 5, May 2005

• 
  Arturo Magidin, David McKinnon:
  Gauss's Lemma for Number Fields. 385-416
• 
  Florian L. Deloup:
  The Fundamental Group of the Circle Is Trivial. 417-425
• 
  Antonio Behn, Christopher Kribs-Zaleta, Vadim Ponomarenko:
  The Convergence of Difference Boxes. 426-439
• 
  Paul E. Becker:
  Do Normal Subgroups Have Straight Tails? 440-449

Notes

• 
  Raghib M. Abu-Saris, Wajdi Ahmad:
  Avoiding Eigenvalues in Computing Matrix Powers. 450-454
• 
  Francesc Comellas, José Luis Andres Yebra:
  Exact Solutions for Minimax Optimization Problems. 454-458
• 
  F. G. Avkhadiev:
  A Simple Proof of the Gauss-Winckler Inequality. 459-462
• 
  Mowaffaq Hajja:
  Copositive Symmetric Cubic Forms. 462-466

Problems & Solutions

• 
  Mircea Ivan:
  Problem 11152. 467
• 
  Paul Bracken:
  Problem 11153. 467
• 
  Kent Holing:
  Problem 11154. 467
• 
  Emmanuel Kowalski:
  Problem 11155. 467
• 
  Richard P. Stanley:
  Problem 11156. 467-468
• 
  Hillel Gauchman:
  Problem 11157. 468
• 
  David Beckwith:
  Problem 11158. 468

Solutions

• 
  Juan-Bosco Romero Márquez, Martin E. Muldoon:
  Gamma Function Bounds: 11016. 468
• 
  Tim Keller, Doyle Henderson:
  One Good Factorization Deserves Another: 11029. 469
• 
  Mark Pinsky, Nicholas Singer:
  The Stationary Distribution of a Tridiagonal Row-Stochastic Matrix: 11032. 469-470
• 
  M. N. Deshpande, R. M. Welukar, Richard Stong:
  Expansion by Inclusion-Exclusion: 11033. 470-472
• 
  Omer Yayenie, Joe Geiman:
  Evaluation of an Integral: 11035. 472-473
• 
  M. L. J. Hautus, Julien Grivaux:
  Shrinking Fréchet Differentiable Maps: 11037. 473-474
• 
  Floor van Lamoen, Michel Bataille:
  Morley's Triangle and Lemma: 11038. 474

Reviews

• 
  Daniel J. Madden:
  Abstract Algebra by Ronald Solomon; Integers, Polynomials and Rings by Ronald S. Irving. 475-478
• 
  John Sylvester:
  Introduction to the Mathematics of Medical Imaging by Charles L. Epstein. 479-480

Volume 112, Number 6, June - July 2005

• 
  Arthur T. Benjamin, Naiomi T. Cameron:
  Counting on Determinants. 481-492
• 
  Jonathan M. Borwein, Kwok-Kwong Stephen Choi, Wilfried Pigulla:
  Continued Fractions of Tails of Hypergeometric Series. 493-501
• 
  Michel Balinski:
  What Is Just? 502-511

Notes

• 
  Nathaniel Grossman:
  A Lagrange Inversion Theorem. 512-514
• 
  Mark A. Pinsky:
  Mean Values and the Maximum Principle: A Proof in Search of More Theorems. 515-521
• 
  Hiroshi Maehara, Tudor Zamfirescu:
  On the Perimeter of a Triangle in a Minkowski Plane. 521-522
• 
  Daniel Frohn:
  A (K)-Ring Satisfying the Ascending Chain Condition on Principal Ideals That Is Not a Principal Ideal Ring. 523-524
• 
  Lee Lorch:
  Continuous Ranking of Zeros of Cylinder Functions. 524-525

The Evolution of ...

• 
  Viktor Blåsjö:
  The Isoperimetric Problem. 526-566

Problems and Solutions

• 
  George Lamb:
  Problem 11159. 567
• 
  Marc Chamberland:
  Problem 11160. 567
• 
  Emeric Deutsch:
  Problem 11161. 567
• 
  Paolo Perfetti:
  Problem 11162. 567
• 
  Michel Bataille:
  Problem 11163. 567
• 
  José Luis Díaz-Barrero:
  Problem 11164. 568
• 
  Yogesh More:
  Problem 11165. 568

Solutions

• 
  William P. Wardlaw, Richard Stong:
  Adjoint over the Smallest Field: 11034. 568-569
• 
  M. L. Glasser, George Lamb:
  One Easy, One Hard: 11036. 569-572
• 
  Noah A. Rosenberg, Richard Bagby:
  Integral over a Simplex: 11039. 572-573
• 
  Yongge Tian, et al.:
  Range Identities for Hermitian Idempotent Matrices: 11040. 573
• 
  M. N. Deshpande, John Henry Steelman:
  An Invariance of Variance over Expectation: 11042. 573-574

Reviews

• 
  D. J. H. Garling:
  The Cauchy-Schwarz Master Class: An Introduction to the Art of Mathematical Inequalities by J. Michael Steele. 575-579
• 
  Loukas Grafakos:
  Constantin Carathéodory: Mathematics and Politics in Turbulent Times by Maria Georgiadou. 579-581

Volume 112, Number 7, August - September 2005

• 
  Kang-Tae Kim, Steven G. Krantz:
  The Automorphism Groups of Domains. 585-601
• 
  Greg Dresden, Wayne M. Dymàcek:
  Finding Factors of Factor Rings over the Gaussian Integers. 602-611
• 
  Dov Aharonov, Alan F. Beardon, Kathy Driver:
  Fibonacci, Chebyshev, and Orthogonal Polynomials. 612-630
• 
  Stephen T. Ahearn:
  Tolstoy's Integration Metaphor from War and Peace. 631-638

Notes

• 
  Mark Finkelstein, Robert Whitley:
  Eigenvalues, Almost Periodic Functions, and the Derivative of an Integral. 639-641
• 
  João Araújo, James D. Mitchell:
  An Elementary Proof That Every Singular Matrix Is a Product of Idempotent Matrices. 641-645
• 
  Michael J. Grady:
  A Group Theoretic Approach to a Famous Partition Formula. 645-651
• 
  David A. Ross:
  An Elementary Proof of Lyapunov's Theorem. 651-653

Problems and Solutions

• 
  Greg Oman:
  Problem 11166. 654
• 
  Vicentiu D. Radulescu:
  Problem 11167. 654
• 
  Kent Holing:
  Problem 11168. 654
• 
  Mohammad Hossein Mehrabi:
  Problem 11169. 654
• 
  Emeric Deutsch:
  Problem 11170. 655
• 
  Chu Cheng:
  Problem 11171. 655
• 
  Heinz-Jürgen Seiffert:
  Problem 11172. 655

Solutions

• 
  Óscar Ciaurri, Florin Boca:
  Hyperbolic-Looking Special Functions: 11041. 655-657
• 
  Michael Golomb:
  Don't the Problem Ebitees Read the Monthly? 11043. 657
• 
  Michel Bataille, Li Zhou:
  A Combinatorial Sum Goes on Tangent: 11044. 657-659
• 
  Matthias Beck, Marcin Mazur, Shelemyahu Zacks:
  "Ordinary" Spherical Triangles: 11048. 659-660
• 
  Vasile Mihai, Zoltán Vörös:
  One of the Morley Triangles: 11049. 660-661
• 
  Wu Wei Chao:
  Two Functional Equations: 11053. 661-662
• 
  Razvan A. Satnoianu, Daniele Donini:
  Medians and Altitudes and the Sum of the Radii: 11055. 662-663

Reviews

• 
  Kenneth B. Stolarsky:
  Analytic Theory of Polynomials by Qazi Ibadur Rahman; Gerhard Schmeisser; Complex Polynomials by Terry Sheil-Small. 664-671

Volume 112, Number 8, October 2005

• 
  Karl Dilcher, Kenneth B. Stolarsky:
  A Pascal-Type Triangle Characterizing Twin Primes. 673-681
• 
  David A. Cox, Jerry Shurman:
  Geometry and Number Theory on Clovers. 682-704
• 
  George Leibman:
  A Nonstandard Proof of the Fundamental Theorem of Algebra. 705-712
• 
  Leonard F. Klosinski, Gerald L. Alexanderson, Loren C. Larson:
  The Sixty-Fifth William Lowell Putnam Mathematical Competition. 713-725

Notes

• 
  N. V. Rao:
  The Stone-Weierstrass Theorem Revisited. 726-729
• 
  Jonathan Sondow:
  A Faster Product for and a New Integral for ln. 729-734
• 
  I. M. Isaacs, Mohammad Reza Pournaki:
  Generalizations of Fermat's Little Theorem via Group Theory. 734-740
• 
  Geoffrey Brown:
  Convexity and Minkowski's Inequality. 740-742

The Evolution of ...

• 
  Boris A. Rosenfeld:
  The Analytic Principle of Continuity. 743-748

Problems and Solutions

• 
  M. N. Deshpande:
  Problem 11173. 749
• 
  Pál Péter Dályay:
  Problem 11174. 749
• 
  William Calbeck:
  Problem 11175. 749
• 
  Oleg Faynshteyn:
  Problem 11176. 749
• 
  Dorin Marghidanu:
  Problem 11177. 750
• 
  Jon Louis Bentley, Colin L. Mallows:
  Problem 11178. 750
• 
  David Beckwith:
  Problem 11179. 750

Solutions

• 
  Manoj Prakash Singh, Richard Stong:
  A Prime Summandification of n: 11045. 750-751
• 
  Syrous Marivani, O. P. Lossers:
  Modular Sequences Defined by Polynomials: 11047. 751
• 
  Shahin Amrabov, Bernardo M. Ábrego:
  An Application of Fermat's Little Theorem: 11054. 751
• 
  John H. Lindsey II, Omran Kouba:
  Maximum Compared to Average: 11056. 752
• 
  Óscar Ciaurri, O. P. Lossers:
  A Vanishing Infinite Sum: 11058. 752-753
• 
  Matthew E. Coppenbarger:
  "Little Boxes Made of Ticky-Tacky": 11060. 753-754
• 
  Kenneth Schilling:
  Powered Divergence: 11062. 754-755
• 
  John E. Wetzel, Li Zhou:
  Lengths of Wrapped Curves: 11064. 755
• 
  Douglas B. Tyler, Robin Chapman:
  A More General Presentation: 11065. 755-756

Reviews

• 
  Judith V. Grabiner:
  From Newton to Hawking: A History of Cambridge University's Lucasian Professors of Mathematics by Kevin C. Knox; Richard Noakes. 757-762

Volume 112, Number 9, November 2005

• 
  Ibtesam Bajunaid, Joel M. Cohen, Flavia Colonna, David Singman:
  Function Series, Catalan Numbers, and Random Walks on Trees. 765-785
• 
  Dan Kalman:
  Virtual Empirical Investigation: Concept Formation and Theory Justification. 786-798
• 
  Nikolai V. Ivanov:
  A Differential Forms Perspective on the Lax Proof of the Change of Variables Formula. 799-806
• 
  Roger C. Alperin:
  The Modular Tree of Pythagoras. 807-816

Notes

• 
  Ray Redheffer:
  The Behavior of Solutions near a Stable or Semistable Stationary Point. 817-822
• 
  Michael Nyblom:
  More Nested Square Roots of 2. 822-825
• 
  A. R. Naghipour:
  A Simple Proof of Cohen's Theorem. 825-826
• 
  Thierry Coquand, Henri Lombardi:
  A Short Proof for the Krull Dimension of a Polynomial Ring. 826-829
• 
  Robert Myers:
  An Elementary Proof of Joris's Theorem. 829-831

The Evolution of ...

• 
  Michael Monastyrsky:
  Some Remarks on "Mathematics at the Tlirn of the Millennium". 832-838

Problems and Solutions

• 
  Suat Namli:
  Problem 11180. 839
• 
  M. N. Deshpande:
  Problem 11181. 839
• 
  Shahin Amrahov:
  Problem 11182. 839
• 
  David Beckwith:
  Problem 11183. 839
• 
  Slavko Simic:
  Problem 11184. 840
• 
  Rainer Brück:
  Problem 11185. 840
• 
  Angelo J. Christino Jr., William C. Waterhouse:
  Problem 11186. 840

Solutions

• 
  Kent Holing, Richard Stong:
  A Special Set of Integer Points in Space: 11050. 840-841
• 
  Slavko Simic, John H. Lindsey II:
  Equivalent Asymptotics: 11063. 841-843
• 
  George Lamb, O. P. Lossers:
  Integral by Mellin Transform: 11067. 843-844
• 
  Herbert S. Wilf, Kenneth Schilling:
  Think Rationally: 11068. 844-845
• 
  George Lamb, T. K. Callahan:
  Evaluate an Integral: 11072. 845-846

Reviews

• 
  J. David Logan:
  Mathematical Models in Biology by Elizabeth S. Allman; John A. Rhodes. 847-850
• 
  Virginia McShane Warfield:
  Count Down: Six Kids Vie for Glory at the World's Toughest Math Competition by Steve Olson. 850-851

Volume 112, Number 10, December 2005

• 
  Volume Information.
• 
  Lisa D. Humphreys, P. Joseph McKenna:
  When a Mechanical Model Goes Nonlinear: Unexpected Responses to Low-Periodic Shaking. 861-875
• 
  Eric Driver, Philip A. Leonard, Kenneth S. Williams:
  Irreducible Quartic Polynomials with Factorizations modulo p. 876-890
• 
  Stephen M. Zemyan:
  On the Zeroes of the Nth Partial Sum of the Exponential Series. 891-909

Notes

• 
  Jan J. Dijkstra:
  On Homeomorphism Groups and the Compact-Open Topology. 910-912
• 
  Zhibo Chen, Gary L. Mullen:
  Transpositions and Representability. 913-919
• 
  Oleg Pikhurko:
  Generating Edge-Labeled Trees. 919-921
• 
  Adrian Dumitrescu:
  A Remark on the Erdős-Szekeres Theorem. 921-924
• 
  Seon-Hong Kim:
  On the Moduli of the Zeros of a Polynomial. 924-925

The Evolution of ...

• 
  Leif Arkeryd:
  Nonstandard Analysis. 926-928

Problems and Solutions

• 
  Li Zhou:
  Problem 11187. 929
• 
  David Bailey:
  Problem 11188. 929
• 
  Lajos Csete:
  Problem 11189. 929
• 
  José Luis Díaz-Barrero:
  Problem 11190. 929
• 
  Barthel Wayne Huff:
  Problem 11191. 929-930
• 
  Brett Stevens:
  Problem 11192. 930
• 
  Marian Tetiva:
  Problem 11193. 930

Solutions

• 
  Floor van Lamoen:
  Six Surprises from Four Lines: 11025. 930-932
• 
  Sebastian M. Cioaba, Tim LeSaulnier, Dan Saracino:
  A Sufficient Condition for Commutativity: 11066. 932-933
• 
  Péter Ivády, Richard Stong:
  Sine Bound: 11069. 933
• 
  Götz Trenkler, Lawrence J. Baker:
  An Easy Complex Inequality: 11075. 933
• 
  Gheorge Costovici, Uros Milutinovic:
  An Oscillating Sequence: 11077. 934
• 
  Razvan A. Satnoianu, Li Zhou:
  A Majorization Consequence: 11080. 934-935
• 
  Stephen Morse, Robin Chapman:
  Harmonious Trios Are the Vertices of a Regular Icosahedron: 11081. 935
• 
  Michael Golomb, Kit Hanes:
  The Orthocenter of a Simplex: 11087. 936
• 
  Wu Wei Chao:
  Errata: Continuous Additive Functions. 936
• 
  Marty Getz, Dixon Jones:
  Errata: Partitioning by Arithmetic Progressions. 936

Reviews

• 
  Gerald B. Folland:
  Functional Analysis by Peter D. Lax; John Wiley; Functional Analysis: An Introduction by Yuli Eidelman; Vitaly Milman; Antonis Tsolomitis. 937-940
• 
  Bruce P. Palka:
  Editor's Endnotes. 941-946