Kuratowski: Sur l’opération A de l’Analysis Situs

What changed

Analyzed an abstract closure operation through axioms for extensivity, union preservation, the empty set and idempotence, helping formalize topological structure through closure.

Scientific scope

The record is the exact 1922 Fundamenta Mathematicae paper. Kuratowski’s thesis version, closure-complement theorem, separation axioms and later general-topology texts remain separate.

Evidence

The linked sources identify this contribution and its scope. WRS has not independently reconstructed the scientific claims. The record is the exact 1922 Fundamenta Mathematicae paper. Kuratowski’s thesis version, closure-complement theorem, separation axioms and later general-topology texts remain separate.

Contributors

• Kazimierz Kuratowski · SCIENCE: Named source author of the scoped work; individual effort shares are not measured.

• EuDML full record for Kuratowski closure paper
• Crossref record for Kuratowski closure paper

Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.

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