Mathematics Magazine prints in black and white, but authors often send in color diagrams. Usually this does not present a problem. We use the color diagrams in the online version of the article. In most cases, the color diagrams are still perfectly readable when rendered in black and white, meaning there is no need to prepare separate black and white diagrams for the print magazine. Unfortunately, that was not the case with the article, “A Few Ripe Red-Blue Cherries” by Scott Andrew Herman, published in the June 2022 issue. When the red and blue cherries of the title were rendered in black and white, the resulting shades of gray appeared identical, rendering the print version of the article all but unreadable. I would urge anyone interested in this article to have a look at the online version, where everything appears as it should. If anyone reading this does not have access to the online version, then simply write to me directly at [email protected], and I will send a copy to you. I greatly regret the error in allowing this printing issue to slip through.
In the December 2021 issue, we ran an article called “A Frameless 2-Coloring of the Plane Lattice” by C. W. Groetsch and Jeffrey Shallit. It has since come to light that Theorem 3 of that paper was stated, without proof, in a 1965 paper by Hao Wang [Citation1]. We thank Jean-Paul Allouche for calling this to our attention.
References
- Wang, H. (1965). Games, logic and computers. Sci. Amer. 213(5): 98–107.