Thanks, Michael R. & Bill D. Bill D. writes: << One can gain some idea of Kaplansky's work and its influence by searching books.google.com for "Kaplansky theorem". This yields 344 hits - more than most of his contemporaries. See the list below which includes a random sample of his contemporaries along with a mix of older luminaries for comparison. . . . . . .

...

Dilworth? --Dan