Kirkman's schoolgirl problem is a problem in combinatorics proposed by Rev. Thomas Penyngton Kirkman in 1850 as Query VI in The Lady's and Gentleman's Diary (pg.48). The problem states:
Fifteen young ladies in a school walk out three abreast for seven days in succession: it is required to arrange them daily so that no two shall walk twice abreast.
Read more about Kirkman's Schoolgirl Problem: Solution, History, Generalization, Other Applications
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“You are a problem and rune,
you are mystery;
writ on a stone.”
—Hilda Doolittle (1886–1961)