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Step * of Lemma fset-image-singleton

∀[eqt,eqa,f,x:Top].  (f"({x}) ~ {f x})
BY
{ (Auto THEN RepUR ``fset-singleton fset-image f-union fset-union l-union`` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[eqt,eqa,f,x:Top].    (f"(\{x\})  \msim{}  \{f  x\})


By

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Latex:
(Auto  THEN  RepUR  ``fset-singleton  fset-image  f-union  fset-union  l-union``  0  THEN  Auto)

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