@themattsimpson hm. sup_A is a property of the closure of the set f(A). max_cl(A) {f(a)} is also a property of the closure of the set f(A).
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@themattsimpson hm. sup_A is a property of the closure of the set f(A). max_cl(A) {f(a)} is also a property of the closure of the set f(A).