Impossibility

• Epistemic impossibility, in modal logic a statement that cannot be true, given what we know
• Subjunctive impossibility, types of statement that cannot be true based on various types of subjunctive modality
• Logical impossibility, a statement that contains a logical contradiction
• Impossible world, a concept in philosophical logic

• Impossibility of performance, in contract law an excuse for non-performance of a contract
• Impossibility defense, a criminal defense for a crime that was legally impossible to commit
• Proof of impossibility, in mathematics a proof that demonstrates that a particular problem cannot be solved

• Impossible (disambiguation)
• Possibility (disambiguation)

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