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Phi is, above all things, the 21st letter in the Greek alphabet, so it's hard to say who created it. However, the number commonly attached to it, the golden ratio, has a long history, starting with the mathematicians of Ancient Greece, and has been studied, used, and approximated ever since. Just a few of the mathematicians who studied Phi are Euclid, who gave the earliest known definition of the golden ratio; Kepler, who described it as one of the two greatest feats of mathematics (along with the Pythagorean Theorem); Michael Maestin, who was among the first to give a rough approximation of the golden ratio's value; and Mark Barr, who first used the letter Phi to describe the ratio.
So, I guess in the end the creation of Phi was sort of a group effort.
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When was Phi Delta Phi created?
Delta Phi was created on 1827-11-17.
When was Phi Sigma Sigma created?
Phi Sigma Sigma was created on 1913-11-26.
When was Phi Zeta created?
Phi Zeta was created in 1925.
When was Phi Sigma Tau created?
Tau Phi Sigma was created on 1992-11-11.
When was Sigma Phi Omega created?
Omega Phi Chi was created on 1988-11-09.
When was Phi Delta Gamma created?
Phi Gamma Delta was created on 1848-05-01.
When was Eta Sigma Phi created?
Eta Sigma Phi was created in 1924.
When was Alpha Sigma Phi created?
Alpha Sigma Phi was created on 1845-12-06.
When was Kappa Delta Phi created?
Kappa Delta Phi was created on 1900-04-14.
When was Mu Alpha Phi created?
Mu Alpha Phi was created on 1927-10-24.
When was Sigma Pi Phi created?
Sigma Pi Phi was created in 1904.
When was Phi Delta Theta created?
Phi Delta Theta was created on 1848-12-26.
