Erdős problem 593
Which finite triple systems occur in every triple system of uncountable chromatic number? The claimed characterization: exactly those that, after removing isolated vertices, are linear, have every hyperedge-node of their Levi graph meeting a bridge, and have every Berge cycle even.
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- Problem row
- sha256:f63e794eb5a4ebed86edc2be7cb1c67fdb4163674788c23c824134a6c00f26ac
- Metadata
- sha256:d2c99a9a07f2a167de1c2d71f49c346b451382eab97bd52bc6000e9058509343
- Observation
- sha256:8c823d621b7e1256c8e47c60a5f1c54c016a5507e6f27b2bab537f6f5f232067
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- sha256:b79ad7a8dd5dcef62bc1fdcccde4c83c7414643fc71e659e3e32c6d31f820ed3
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- sha256:a956b84c437202e5a02cc9e036a621bd14a302b34a75758115730bdbb77c52a4
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- 2415f78e850aeee50afdca525c6f2e0ea606f207