Franz Schaefer (Mond)
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Happy 399th Birthday: The Integration
Sign:
The manuscript page on the cover shows the moment
that Leibniz introduced the integral sign ∫.It is from one of several memoranda he wrote to himself during his remarkable stay in Paris during the years 1672–1676.
These were discovered in Hannover and transcribed by Carl Immanuel Gerhardt in the mid-nineteenth century.
The particular one at hand is dated October 29, 1675.