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This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-06-02 and was most recently seen on 2026-06-02.
In mathematics, a binary relation R is called well-founded on a set or, more generally, a class X if every non-empty subset S ⊆ X has a minimal element with respect to R; that is, there exists an m ∈ S such that for every s ∈ S, one does not have s R m. More formally, a relation is well-founded if:
Some authors include an extra condition that R is set-like, i.e., that the elements less than any given element form a set.
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