Item:Q1399: Difference between revisions
Created a new Item: Gδ set, countable intersection of open sets |
Created claim: part of (P7): Borel hierarchy (Q790) |
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| Property / subclass of | |||
| Property / subclass of: subset / rank | |||
Normal rank | |||
| Property / part of | |||
| Property / part of: Borel hierarchy / rank | |||
Normal rank | |||