Proclaim
发表于 2025-3-30 09:40:30
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CARK
发表于 2025-3-30 12:25:04
The Axiom of Choice,For the deepest results about partially ordered sets we need a new settheoretic tool; we interrupt the development of the theory of order long enough to pick up that tool.
内疚
发表于 2025-3-30 18:12:53
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geriatrician
发表于 2025-3-30 21:56:36
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极端的正确性
发表于 2025-3-31 04:56:36
Families,generally accepted way of communicating the notation and indicating the emphasis is to speak of a family {..} in ., or of a family {..} of whatever the elements of . may be; when necessary, the index set . is indicated by some such parenthetical expression as (. ∈ .).
HARD
发表于 2025-3-31 07:40:27
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遗传
发表于 2025-3-31 10:20:00
Unions and Intersections, generalization of itself; surely a similar construction should apply to arbitrary collections of sets and not just to pairs of them. What is wanted, in other words, is the following principle of set construction.
一个姐姐
发表于 2025-3-31 17:11:16
Relations,An example of a ternary relation is parenthood for people (Adam and Eve are the parents of Cain). In this book we shall have no occasion to treat the theory of relations that are ternary, quaternary, or worse.
MEEK
发表于 2025-3-31 19:30:42
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Detain
发表于 2025-4-1 01:30:38
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