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Theorem

Change-theorem

Modifying constructor for theorem structures.

Syntax

(change-theorem x 
                [:name <name>] 
                [:variables <variables>] 
                [:formula <formula>])

This is an often useful alternative to make-theorem.

We construct a new theorem structure that is a copy of x, except that you can explicitly change some particular fields. Any fields you don't mention just keep their values from x.

Definition

This is an ordinary change- macro introduced by fty::defprod.

Macro: change-theorem

(defmacro change-theorem (x &rest args)
  (std::change-aggregate 'theorem
                         x args
                         '((:name . theorem->name)
                           (:variables . theorem->variables)
                           (:formula . theorem->formula))
                         'change-theorem
                         'nil))