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## Main Question or Discussion Point

I am struggling to properly understand the concept of a well-founded set.

Is this well founded, d = {{x},{x,y},{x,y,z}}

because there exists an element of d i.e. {x} = e

such that d n e = 0 ???

Is this well founded, d = {{x},{x,y},{x,y,z}}

because there exists an element of d i.e. {x} = e

such that d n e = 0 ???