trureturingGitHub MATHEMATICAL ATLAS

Combinatorics / CONCEPT

Bridge Contraction in Bipartite Graphs

Identifying the endpoints of a bridge preserves proper two-colourings, minimum degree at least three, and the lengths of all cycles.

Closed Authored exposition
DIRECT PREREQUISITES0
DIRECT CONSEQUENCES2
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DOCUMENT LINKS0
THEOREM

A cycle stays on one side of a cut vertex

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Direct recorded relationships
Bridge Contraction in Bipartite GraphsBridge Contraction in BipartiteGraphsConnected Subgraph Counts at a BridgeConnected Subgraph Counts at aBridgeMinimal bipartite Erdős–Gyárfás counterexamples have no bridgeMinimal bipartite Erdős–Gyárfáscounterexamples have no bridge
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Certified topology / DOWNSTREAM

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Lean sourceResearch workspace
Status
Closed
Depth
0
Layer
D5/S3
Domain
Combinatorics
Node ID
D5/S3/Combinatorics/Graph/ErdosGyarfasBridgeContraction
Repository path
D5/S3/Combinatorics/Graph/ErdosGyarfasBridgeContraction.lean
Truth release
sha256:76a8db6a0f78609b1b9d4a959c8392f2752f2daaddc1930e046e34ce07d0f608
Source commit
b52262a023c4db9bb30a128ebfd80ea4ef4c1a53
Source tree
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.