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This rule is a "placeholder" for a number of ways to infer

K |

F |

- This has been shown in a previous proof or is shown as a subproof.
- This holds because
`F`is a*propositional consequence*of`K`, i.e., the conclusion holds independently of the truth values of the atomic formulas and quantified formulas contained in`K`and`F`. - This is an instance of some
*quantifier consequence*wich give true conclusions in every domain. - This is derived by applying
*substitution*rules from known equalities and equivalences.

Author: Wolfgang Schreiner

Last Modification: November 30, 1999