Abbreviations:

AMM = American Mathematical Monthly

MM = Mathematics Magazine

CMJ = College Mathematics Journal

Counting good bit string arc diagrams, #11312, AMM **115** (2008),
461, solution **117** (2010),
187.

A uniform distribution on lattice paths, #11312, AMM **114** (2007),
744, solution **116** (2009),
552.

Divisibility of a central binomial sum, #11292, AMM **114** (2007),
451 (published again as #11307 on p 640!), solution **116** (2009),
468.

The maximum associativeness of division, #11091, AMM **113** (2006),
462.

A combinatorial identity, #1718, MM **78** (2005),
158 and (corrected) 324.

Counting restricted lattice paths, #11106, AMM **111** (2004),
725.

Counting repeated quotients, #11091, AMM **111** (2004),
534.

` Dyck paths avoiding the points (4k,0),` #11013, AMM
**109** (2003), 438, solution **112** (2005),
184.

A permanent fixture, #10925, AMM **109** (2002),
201, solution **110** (2003),
960.

Trees and partitions, #10952, AMM **109** (2002),
569.

` The Car and Goats problem revisited`,
#666, CMJ **31** (2000), 62.

Counting periodic points, #10666, AMM **105** (1998),
464.

A French inheritance law, #10652, AMM **105** (1998),
271.

A derangement number identity, #10643, AMM **
105** (1998), 175.

A uniform distribution, #10636, AMM **105** (1998),
68.

Divisibility of sums and subsets, Q867, MM **70** (1997), 224.

One divisibility condition on arithmetic functions implies another,
Q861, MM **70** (1997), 66.

The permanent of a stochastic Hessenberg matrix, MM, December
1996.

A sum over partitions, AMM, February, 1996.

Factorials, least common multiples and divisibility, MM,
February 1996.

A Quickie binomial coefficient identity, Q833, MM,
June 1995.

On matrix ranks, Problem No. 1422, MM, April 1993.

On a Pascal-like triangle, CMJ, March 1993.

A combinatorial identity, Problem No. 1394, MM, April 1992.

On algebraic integers and the tangent function, E3461, AMM,
October 1991.

On rational functions, Problem No. 1348, MM, June 1990.

On recurrence relations and divisibility, Problem No. 1335, MM,
December 1989.

On arithmetic progressions, Quickie No. 744, MM, February 1989.

On positive numbers, Quickie No. 715, MM, December 1986.

On stochastic matrices and minimal trace, Advanced Problem No. 6507,
AMM, January 1986.

On stochastic matrices and maximal entries, Problem No. 1228, MM, November
1985.

On tossing a die, Problem No. 1217, MM, May 1985.

Oddly triangulated polygons, #11298, AMM
**116** (2009),
371.

Another description of the central Delannoy numbers, #10894, AMM
**110** (2003),
443.

Another binomial coefficient identity, #10878, AMM
**110** (2003),
342.

A property of the binary sum of a family of sets, #10865, AMM **109** (2002),
859.

A recursively defined sequence of functions, #10758, AMM **109** (2002),
303.

Another path to generalized Catalan numbers, #10751, AMM
**108** (2001), 872.

A rational generating function for relative divisors, #10750, AMM
**108** (2001), 670.

A generalization of Hall's theorem, #10701, AMM **108** (2001), 79.

` A bijection between marked trees`, Solution for #10781,
AMM **107** (2000), 176, proposed by Leonard Smiley.

Another type of lattice path, #10658, AMM **107** (2000), 369.

` A Smith normal form`,
#1567, MM **731** (2000), 67.

On a convolution of Eulerian numbers, #10596, AMM **106** (1999),
690.

Binary expansions and kth powers, #10596, AMM **106** (1999), 366.

Catalan and Hankel, #10596, AMM **106** (1999), 170.

Minimal special matrices, #10470, AMM **105** (1998), 772.

Symmetrized positive definiteness, #19-5, ILAS Image **
20** (1998), 29.

Möbius functions on the partition lattice, #10506, AMM
**105** (1998), 373.

From roots of unity to the Möbius function, #598, CMJ
**29** (1998), 154.

The number of positive semidefinite 0-1 matrices, #10481, AMM
**104** (1997),
877.

A characteristic polynomial, Problem No. 1502, MM **70** (1997),
227-228.

A bijection between sets of permutations, #10364,
AMM **104** (1997), 179.

A sufficient condition for nilpotence, #10339, AMM **103** (1996),
908.

Derived matrices with the same characteristic polynomial, #10334,
AMM **
103** (1996), 606.

One step beyond, #10288, AMM **103** (1996), 511.

Recovering individuals from the joint distribution of sums, #10304,
AMM **103** (1996), 428.

Polynomialrecurrençology, #10300, AMM **103** (1996),
273.

Bounds on matrix sums, Problem No. 526, CMJ,
May, 1995.

Ring homomorphisms and Carmichael numbers, Problem No. 1434, MM,
December
1994.

Buffon's square, Problem No. 1414, MM, February 1994.

Nonnegative curve fitting, 10219, AMM, February 1994.

An identity with the floor function, Problem No. 1410, MM,
December 1993.

On a difference equation, Problem No. 1406, MM, October 1993.

Strong fixed points of permutations, E3467, AMM, October
1993.

Extraneous primes, E3452, AMM, April 1993.

On functional equations, Problem No. 1398, MM, June 1993.

Distributing stones in cups, Problem No. 1388, MM, February 1993.

On a periodic sequence, E3437, AMM, November 1992.

On harmonic numbers, Advanced Problem No. 6616, AMM, October
1992.

Trigonometric inequalities, E3306, AMM, December 1991.

` Inequalities Involving Trigonometric Functions`, E3306, AMM, December 1991.

Composition of differentiable functions, Problem No. 1361, MM,
December 1991.

Slowly converging sets, E3367, AMM, December 1991 (with Douglas
West).

Consequence of a recurrence relation, E3367, AMM, December
1991.

Factorizing certain characteristic polynomials, Problem No. 1357,
MM, October 1991.

An extremely rapidly converging sequence, E3360, AMM, May
1991.

A formula for gcd, Problem No. 1344, MM, April 1991.

An exponential limit, Problem No. 1338, MM, February 1991.

Eigenvalues of sine and cosine matrices, Advanced Problem No. 6591,
AMM,

January, 1991 (with Grace Wahba).

An Erdös problem on graphs, E3255, AMM, November 1990.

Inperfect numbers, Problem No. 1329, MM, October 1990.

A binomial coefficient inequality, E3309, AMM, August-September
1990.

Maximizing symmetric functions of side differences in triangles,
E3305, AMM, April 1990.

A determinant identity with matrix entries, E3286, AMM,
March 1990.

On real roots of a certain polynomial, Problem No. 1315, MM,
February 1990.

A recurrence for a summation, E3153, AMM, December 1989.

Iterated bijections, Problem No. 1308, MM, December 1989.

A combinatorial identity, Problem No. 1304, MM, October 1989.

On Touchard's identity, E3258, AMM, August-September, 1989.

Matrices displaying their eigenvalues, E3245, AMM,
June-July 1989.

Subrings and ideals of symmetric polynomials, Problem No. 1301,
MM, June 1989.

On the greatest common divisor property, Problem No. 1293, MM, April
1989.

A problem on permutations, E3163, AMM, January 1989.

An inequality for polynomial roots, E3184, AMM, November 1988.

Inverse of a combinatorial matrix, E3161, AMM, October 1988.

A varied menu, E3163, AMM, June-July 1988.

On binary sequences, Problem No. 1258, MM, February 1988.

Optimal strategy for a computer game, E3060,
AMM, October 1986.