中产阶级 发表于 2025-3-21 17:31:58

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套索 发表于 2025-3-21 22:57:00

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线 发表于 2025-3-22 01:56:30

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colloquial 发表于 2025-3-22 06:51:35

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聋子 发表于 2025-3-22 10:43:46

The Classification Programme,In this book, we have presented group theory as an abstraction based on certain natural, familiar (and not so familiar) mathematical systems: systems of numbers, vectors, matrices, permutations and symmetries. What these systems share is what we formulated into the group axioms — associativity, identity, inverses.

倔强一点 发表于 2025-3-22 16:25:32

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倔强一点 发表于 2025-3-22 19:40:35

Phosphorus in Agriculture: 100 % Zeroystem you became familiar with: they include the number . at the beginning. (Zero apples is a perfectly sensible counting number; it is, in fact, exactly the number of apples I have eaten so far today.) This system, the sequence.is called the .. The natural numbers form such a useful system that they are given a special name: ℕ.

Tartar 发表于 2025-3-22 22:29:34

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Asperity 发表于 2025-3-23 02:10:47

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CHASM 发表于 2025-3-23 09:14:40

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