Dashed left edge = started before December 1891 ·
Dashed right edge = ongoing beyond December 1891
Events in December 1891 2
1823 – 1891Leopold Kronecker (1823-1891)Died 29 December 1891, aged 68German mathematician known for foundational work in number theory and algebra. He held constructivist views on mathematics, famously remarking that "God made the integers, all else is the work of man." His disputes with Georg Cantor over set theory shaped debates in mathematical foundations.
1891Basketball inventedJames Naismith devises a new indoor sportPhysical education instructor James Naismith devised basketball at a YMCA training school in Springfield, Massachusetts, to give students an indoor winter sport. The first game used peach baskets as goals and a soccer ball. The sport spread rapidly through YMCAs and schools worldwide.