trureturingGitHub MATHEMATICAL ATLAS

FiniteGroups / CONCEPT

The native Coxeter quotient obstruction

The even subgroup of the Coxeter group with string labels four, nine and three has no torsionfree normal subgroup of index seventy-two or with twenty-four actual six-sector block orbits.

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THEOREM

The index-seventy-two and regular twenty-four-block obstructions

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Finite Group Obstruction for Orders Nine, Three and TwoFinite Group Obstruction forOrders Nine, Three and TwoThe native Coxeter quotient obstructionThe native Coxeter quotientobstruction
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Lean sourceResearch workspace
Status
Closed
Depth
1
Layer
D5/S3
Domain
FiniteGroups
Node ID
D5/S3/FiniteGroups/CFMPCoxeterIndexObstruction
Repository path
D5/S3/FiniteGroups/CFMPCoxeterIndexObstruction.lean
Truth release
sha256:76a8db6a0f78609b1b9d4a959c8392f2752f2daaddc1930e046e34ce07d0f608
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b52262a023c4db9bb30a128ebfd80ea4ef4c1a53
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37a24ddf3b9983bdabf0acbfd9b32b06c35c28d3

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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.