Claim 3 of 5 · Case 07 · Philosophy
Two of the three classical laws of logic trace back to Aristotle, and together they remain the basis of ordinary reasoning, though modern logicians have challenged them at the edges.
One claim from the free evidence repository at apologetics.pro.
The three laws are identity, non-contradiction, and excluded middle. Aristotle gave the first sustained defense of non-contradiction and treated it as the firmest principle of all. The honest limit is that twentieth century logicians built non-classical systems that restrict or reject some of these laws in special cases. That does not overturn everyday reasoning, but it means “the laws of logic are absolute and no one questions them” is too strong a way to put it.
Backed by 3 pieces of evidence
Aristotle, “Metaphysics,” Book IV
This is the historical source for the claim that logic is the shared ground of any argument.Encyclopaedia Britannica, “Laws of thought”
This gives a plain, citable statement of the three laws.Non-classical logic, the honest limit
It is worth naming these exceptions rather than overclaiming. Granting them does not undercut the everyday point, and being upfront about them is more credible than pretending they do not exist.