The Gallery
Logic
Kazimierz Twardowski
Anne Sjerp Troelstra
Friedrich Adolf Trendelenburg
Theophrastus
Alfred Tarski
Ralph Strode
Martin Stokhof
Raymond Smullyan
William of Sherwood
John Duns Scotus
Sedulius Scottus
Moses Schönfinkel
Rolf Schock
Albert of Saxony
Giovanni Girolamo Saccheri
Ian Rumfitt
Richard Routley
Frank Plumpton Ramsey
Constantin Rădulescu-Motru
Michael O. Rabin
Mojżesz Presburger
Emil Leon Post
Porphyry
