Not every “if–then” expresses necessity; not every “or” expresses exactly-one disjunction. Simultaneous occurrence does not establish entailment. Most crucially, “not both true” and “not both false” are different constraints. Identify the parts, their relation and the allowed cases.
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Common classification errors
Conditional Propositions: Connected and Disjunctive Forms
Not every “if–then” expresses necessity; not every “or” expresses exactly-one disjunction. Simultaneous occurrence does not establish entailment. Most crucially, “not both true” and “not both false” are different constraints. Identify the parts, their relation and the allowed cases.