# Differences

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sav08:axioms_of_hol [2008/05/28 03:06] vkuncak |
sav08:axioms_of_hol [2015/04/21 17:30] (current) |
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- | ====== Axioms of Classical HOL ====== | + | ====== Axioms and Inference Rules of Classical HOL ====== |

Axiom system that is sound (but necessarily incomplete with respect to standard semantics) is the following: | Axiom system that is sound (but necessarily incomplete with respect to standard semantics) is the following: | ||

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Inference rule: | Inference rule: | ||

- | \[ | + | \begin{equation*} |

\frac{C\ \ ; \ \ A=B} | \frac{C\ \ ; \ \ A=B} | ||

{C[A:=B]} | {C[A:=B]} | ||

- | \] | + | \end{equation*} |

which replaces one occurrence of $A$ in $C$ with $B$ (we cannot replace variables under $\lambda$) | which replaces one occurrence of $A$ in $C$ with $B$ (we cannot replace variables under $\lambda$) |