## problems (and solutions)

- (with Akalu Tefera and Melkamu Zeleke)
Sum of a sequence of floors and ceilings,
*Mathematics Magazine* 71, no. 5 (1998), 390-391.
- A congruence involving ceilings,
*American Mathematical Monthly* 109, no. 1 (2002), p. 77.

A solution (by Nasha Komanda) appeared in
*American Mathematical Monthly* 110, no. 8 (2003), p. 747.
- (with Marcin Mazur and Shelemyahu Zacks)
"Ordinary" spherical triangles,
*American Mathematical Monthly* 110 (2003), p. 956.

A solution (by Richard Stong) appeared in
*American Mathematical Monthly* 112, no. 7 (2005), p. 660.
- (with Jesus A. Deloera, Mike Develin, and Julian Pfeifle)
Some linear recurrences,
*American Mathematical Monthly* 111 (2004), p. 440.

A solution (by the Northwestern University Math Problem Solving Group) appeared in
*American Mathematical Monthly* 113, no. 1 (2006), 84-85.
- (with Richard Ehrenborg and Thomas Zaslavsky)
Magic squares and nontransitive dice,
*American Mathematical Monthly* 111, no. 7 (2004), 625-626.

A solution (by Michael R. Avidon and John H. Lindsey II) appeared in
*American Mathematical Monthly* 113, no. 5 (2006), 464-465.
- (with Alexander Berkovich) An absolute value sum,
*American Mathematical Monthly* 115, no. 3 (2008), p. 263.

Solutions (by Byron Schmuland and Allen Stenger) appeared in
*American Mathematical Monthly* 117, no. 1 (2010), 92-93.