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(texinfo)Equivalence

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`@equiv{}' (==): Indicating Equivalence
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  Sometimes two expressions produce identical results.  You can
indicate the exact equivalence of two forms with the `@equiv{}' command.

  The `@equiv{}' command is displayed as `==' in Info and as a three
parallel horizontal lines in the printed output.

  Thus,

     @lisp
     (make-sparse-keymap) @equiv{} (list 'keymap)
     @end lisp

produces

     (make-sparse-keymap) == (list 'keymap)

This indicates that evaluating `(make-sparse-keymap)' produces
identical results to evaluating `(list 'keymap)'.