PROOF 196
Prove.
Without the parallel postulate there is no Pythagoras
On the Euclidean plane.
Definition D1
In triangle ABC, let ∠C = 90°, and set a = BC, b = CA, c = AB.
Proof.
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PROOF 196
Without the parallel postulate there is no Pythagoras
On the Euclidean plane.
Definition D1
In triangle ABC, let ∠C = 90°, and set a = BC, b = CA, c = AB.
Proof.
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