First, it would be personal tragedy. I'd never voluntarily go back in time. EVER! That said, I'd go ahead and invent modern real analysis (along with the rudiments of abstract algebra) and give the math aficionados of 18th century run for their money. If nothing I'd write simply mind-blowing political and science fiction that takes place in the future (every day life in 20th and early 21st century.)
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First, it would be personal tragedy. I'd never voluntarily go back in time. EVER! That said, I'd go ahead and invent modern real analysis (along with the rudiments of abstract algebra) and give the math aficionados of 18th century run for their money. If nothing I'd write simply mind-blowing political and science fiction that takes place in the future (every day life in 20th and early 21st century.)