trureturingGitHub MATHEMATICAL ATLAS

ArithUnits / CONCEPT

The Half-Factorial Criterion for Minus One

Half of the nonzero residues gives an explicit square root criterion for minus one.

Closed Authored exposition
DIRECT PREREQUISITES1
DIRECT CONSEQUENCES0
PROOF DEPTH1
DOCUMENT LINKS1
THEOREM

The signed half-factorial square, its witness, and its obstruction

RELATIONSHIP ATLAS

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Direct recorded relationships
Wilson's TheoremWilson's TheoremThe Half-Factorial Criterion for Minus OneThe Half-Factorial Criterionfor Minus One
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Certified topology / DOWNSTREAM

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Lean sourceResearch workspace
Status
Closed
Depth
1
Layer
D5/S3
Domain
ArithUnits
Node ID
D5/S3/ArithUnits/HalfFactorial
Repository path
D5/S3/ArithUnits/HalfFactorial.lean
Truth release
sha256:c0d04258d27972c1cf58485e21d64dbcbe336405346ba95133913c64ba2856aa
Source commit
745bf90812f7175f83e1235688249f9495f23bfc
Source tree
143bc6c9ab9054c406f0cdd7f3b296eb38768b5c

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Dependency edges, status, and source coordinates come from the verified release and certified topology. Blueprint exposition is labeled separately. A fallback title carries no additional mathematical authority.