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Related theorems GIF version |
| Description: Rule of Modus Ponens. The postulated inference rule of propositional calculus. See e.g. Rule 1 of [Hamilton] p. 73. The rule says, "if φ is true, and φ implies ψ, then ψ must also be true." This rule is sometimes called "detachment," since it detaches the minor premise from the major premise. |
| Ref | Expression |
|---|---|
| min | ⊢ φ |
| maj | ⊢ (φ → ψ) |
| Ref | Expression |
|---|---|
| ax-mp | ⊢ ψ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | wps | 1 wff ψ |