Quantifier (logic)
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In logic, a quantifier is an operator that specifies how many individuals in the domain of discourse satisfy an open formula. For instance, the universal quantifier ∀ in the first-order formula ∀ x P
Augustus De Morgan (1806–1871) was the first to use "quantifier" in the modern sense.
Charles Sanders Peirce
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Charles Sanders Peirce was an American scientist, mathematician, logician, and philosopher who is sometimes known as "the father of pragmatism". According to philosopher Paul Weiss, writing in 1934, P
Peirce's birthplace. Now part of Lesley University's Graduate School of Arts and Social Sciences.
Peirce in 1859
"The World on a Quincuncial Projection", 1879. Peirce's projection of a sphere onto a square keeps angles true except at four isolated points on the equator, and has less scale variation than the Mercator projection. It can be tessellated; that is, multiple copies can be joined continuously edge-to-edge.
Arisbe in 2011