logic is the study of valid inference: which conclusions are forced by which premises, independent of what the premises are about. 𐃏 it splits cleanly into a syntax (formulas, and rules for pushing them around) and a semantics (truth assignments, models), and the deepest theorems in the subject are exactly the ones that say when the two agree (Epp, Susanna S., 2019).
Natural-Deduction
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Knowledge is a paradox. The more one understand, the more one realises the vastness of his ignorance.