Go backward to ExampleGo up to TopGo forward to Summary |

For all terms `S` and `T`, formulas `A` and
`B`, variables `x` and formula patterns `C` with
variable `F`, the following holds:

**Equality Subsitutions**-
`S`=`T`/\`A`[`x`<-`S`]`A`[`x`<-`T`] **Equivalence Substitutions**-
`A`<=>`B`/\`C`[`F`<-`A`]`C`[`F`<-`B`]

*Replace "equal things by equal things", e.g., insert definitions.*

Author: Wolfgang Schreiner

Last Modification: November 30, 1999