Socrates
Aristotle
Alhazen
Al-Kindi
Alpharabius
Parmenides
Zeno of Elea
Thomas Aquinas
Avicenna
Confucius
Jacques Derrida
René Descartes
Georg Wilhelm Friedrich Hegel
David Hume
Immanuel Kant
Søren Kierkegaard
Laozi
Friedrich Nietzsche
Plato
Willard Van Orman Quine
Jean-Paul Sartre
Arthur Schopenhauer
Ludwig Wittgenstein
Francis Bacon
George Berkeley
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Gottfried Wilhelm Leibniz
Karl Popper
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Alfred North Whitehead
Gottlob Frege
David Kellogg Lewis
John Venn
John Stuart Mill