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- Choose a constant name that reflects the name of the variable.
"We prove (

**forall**`x`:`G`). We take an arbitrary constant`x`_{0}and show`G`[`x`<-`x`_{0}]." - Choose the variable name itself as the constant name.
"We prove (

**forall**`x`:`G`). We take an arbitrary constant`x`and show`G`.""We prove (

**forall**`x`:`G`). Take arbitrary`x`. Then ...(proof of`G`).

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

Author: Wolfgang Schreiner

Last Modification: November 30, 1999