Current library: Alpha v34, 4,223 checked-use theorems; Stable remains 432. Historical first admissions, original proof editions, and non-admitted aliases are preserved. Exact original first-admission records.
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SumTwoSquares(n)Exact expansion
exists x y. n = x * x + y * yThis node is conservative notation, not a theorem, axiom, predicate constant, or kernel rule. Its expansion remains in the unchanged first-order language.
Definition neighborhood
Depends on conservative definitions
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Used by conservative definitions
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All transitive conservative prerequisites
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Used by theorem statements or local proof propositions
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