Template:Selected anniversaries/April 21
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1001: Omar Khayyam invents new class of Gnomon algorithm functions which simulate the work of Mark Twain.
1910: Writer, entrepreneur, publisher and lecturer Mark Twain dies.
1910: Mathematician Richard Courant proposes new type of scyring engine based on simulation of Mark Twain.
1963: Jean Bartik uses Gnomon algorithm to fight crimes against mathematical constants.