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Which is better, an empirical basis for the meanings of the logical connectives or a relevance logic definition of them, and why?

em·pir·i·cal / emˈpirikəl/ (also em·pir·ic) • adj. based on, concerned with, or verifiable by observation or experience rather than theory or pure logic: they provided considerable empirical evidence ...
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Do the paradoxes of material implication in relevance logic, invalidate reductio ad absurdum?

One of the paradoxes of material implication in relevance logic is P → (Q → P) A proof of this statement in classical propositional logic is: P [OSC1] P ∨ ¬Q [1; addition] ¬Q ∨ P [2; commutativity of ...
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