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User:KBlott/Proofs/Max and Min
$\mathbb N + 1 = \lbrace 0, 1, 2, ...;\mathbb N \rbrace$
.
Upper Semilattice on Classical Set is Semilattice
.
User:KBlott/Proofs/Semilattice with Identity is an Idempotent Commutative Monoid
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