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- Introduce a new constant name
"We have to prove (

**exists**`x`:`G`). Take`a`:=`T`. We prove`G`[`x`<-`a`]". - Use the variable name as the constant name
"We have to prove (

**exists**`x`:`G`). Take`x`:=`T`. We then have ...(proof of`G`with additional knowledge`x`=`T`)."

*Constant name must not yet appear in knowledge or goal!*

Author: Wolfgang Schreiner

Last Modification: November 30, 1999