alleryA rigorous proof must avoid relying on:
AStated axioms
BClear definitions
CEmpirical evidence
DInference rules
Answer & Solution
Correct answer: C. Empirical evidence
1. Proofs reduce to inference rules applied to axioms and definitions.
2. They are made without empirical evidence and intuition.
3. Axioms, definitions and rules are exactly what a proof uses.
_Source: Wikipedia, "Mathematics" (rev ?), section "Rigor"_
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