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We have a formula (`F`_{0} \/ ... \/ ...`F`_{n-1})
in our knowledge:

~~>

Kunion {F_{0}\/ ... \/F_{n-1}}G...

Kunion {F_{0}}G

Kunion {F_{n-1}}G

We have to prove `G`. Since we know
(`F`_{0} \/ ... \/ `F`_{n-1}), it suffices to
consider the following cases:

- Case
`F`_{0}: ...(proof of`G`with additional knowledge`F`_{0}). - ...
- Case
`F`_{n-1}: ...(proof of`G`with additional knowledge`F`_{n-1}).

Author: Wolfgang Schreiner

Last Modification: November 30, 1999