Columbia subject headings:
Harvard subject headings:
Hypothesis
Kant, Immanuel, 1724-1804
Metaphysics
Newton, Isaac, 1642-1727
Philosophy
Schopenhauer, Arthur, 1788-1860
Princeton subject headings:
Hypothesis.
Kant, Immanuel, 1724-1804.
Metaphysics.
Newton, Isaac, 1642-1727.
Schopenhauer, Arthur, 1788-1860.