Charles Sanders Peirce (1839–1914) was an American logician, mathematician, scientist and logician. He considered himself to be a logician, though his philosophical achievements also branch into epistemology, philosophy of science and philosophy of language.
Charles Sanders Peirce showed that a joint denial, otherwise known as a nor operation can be used to define every other truth-functional logical operator.
The symbol for the joint denial ( ↓ ) is known as the Peirce arrow after Charles Sanders Peirce.
Peirce also demonstrated that an alternative denial could also be used for the same purpose by 1880. However, Henry M. Sheffer is partly credited with this discovery after he independantly arrived at this result and published it in 1913. Peirce's paper demonstrating the same was not published until 1933. The symbol for the alternative denial, ( | or ↑ ) is called the Sheffer stroke.
Name: Charles Sanders Peirce
Born: September 10, 1839
Died: April 19, 1914
