Combining Philosophers

Ideas for Anaxarchus, Tertullian and Ren Descartes

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5. Theory of Logic / C. Ontology of Logic / 3. If-Thenism
Arithmetic and geometry achieve some certainty without worrying about existence [Descartes]
     Full Idea: Arithmetic, geometry and sciences of that kind only treat of things without taking any great trouble to ascertain whether they are actually existent or not, and contain some measure of certainty.
     From: René Descartes (Meditations [1641], §1), quoted by Alan Musgrave - Logicism Revisited §4
     A reaction: This is Musgrave's earliest quotation which seems to take the if-thenist view.