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%% SPDX-License-Identifier: Apache-2.0
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[;1m  is_empty_set(AnySet)[0m

  Returns [;;4mtrue[0m if [;;4mAnySet[0m is an empty unordered set; otherwise,
  returns [;;4mfalse[0m.

[;1mExamples[0m

    1> sofs:is_empty_set(sofs:empty_set()).
    true
    2> sofs:is_empty_set(sofs:set([a,b])).
    false
