Proves an absolute plane using Side-Angle-Angle and angle addition, suggesting alternative axioms in geometry.
We prove that if we start with a non-continuous absolute plane, remove Side-Angle-Side as an axiom, and replace it with the three new axioms, Side-Angle-Angle, angle addition, and the existence of angle bisectors, then the result is also an absolute plane.
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John Donnelly (2025) studied this question.
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