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- Giuseppe Peano (1858–1932), Italian mathematician.
2011 August 8, John F. Sowa, “Peirce’s Tutorial on Existential Graphs”, in Semiotica, 186:1-4, 345-394:
- Since Peano wanted to use logic for reasoning about mathematics, he replaced Peirce’s symbols with symbols that could be freely mixed with mathematical formulas. Peano gave full credit to Peirce for the notation and declared Frege’s notation unreadable.