alternatehistory.com

Obviously math in general is pretty constant: 2+2 will always equal 4 no matter what universe we're in. But what if people did math differently? What if we used a different system besides base ten, or Arabic numerals never came into use in Europe, or the plus sign was different, or that sort of thing? How different could math possibly be while still making sense?

This is a general thread for discussing that topic. I put it here because most PODs will be pre-1900, but post-1900 PODs are fine too.
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