https://mathoverflow.net/questions/369179/big-ideas-that-began-small-or-smal
l-ideas-that-became-big

I am looking for ideas that began as small and maybe na?ve or weak in some o
bscure and not very known paper, school or book but at some point in history
turned into big powerful tools in research opening new paths or suggesting
new ways of thinking maybe somewhere else.
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