不足木
发表于 2025-3-21 18:00:18
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Libido
发表于 2025-3-21 23:16:37
Propositional Logic,is. According to some traditional views reasoning consists of the building of chains of linguistic entities by means of a certain relation ‘... follows from ....’, a view which is good enough for our present purpose. The linguistic entities occurring in this kind of reasoning are taken to be ., i.e.
handle
发表于 2025-3-22 02:41:22
Predicate Logic,age is patently insufficient for mathematical practice. A simple argument, such as “all squares are positive, 9 is a square, therefore 9 is positive” cannot be dealt with. From the propositional point of view the above sentence is of the form φ ∧ Ψ → σ, and there is no reason why this sentence shoul
邪恶的你
发表于 2025-3-22 05:47:22
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自然环境
发表于 2025-3-22 11:26:41
Second-Order Logic,l elements a of ∣ .∣ ...” and “there exists an element a of ∣.∣ ...”. We will now allow a second kind of variable ranging over subsets of the universe and its cartesian products, i.e. relations over the universe.
perimenopause
发表于 2025-3-22 13:11:28
Intuitionistic Logic,rses can be surveyed in their totality. In particular can we in a global manner determine if ? ⊨ ∃x φ(x) holds, or not. To adapt Hermann Weyl’s phrasing: we are used to think of infinite sets not merely as defined by a property, but as a set whose elements are so to speak spread out in front of us s
追逐
发表于 2025-3-22 18:07:19
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LAVA
发表于 2025-3-23 00:48:50
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entrance
发表于 2025-3-23 03:18:43
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调味品
发表于 2025-3-23 08:58:19
Second-Order Logic,l elements a of ∣ .∣ ...” and “there exists an element a of ∣.∣ ...”. We will now allow a second kind of variable ranging over subsets of the universe and its cartesian products, i.e. relations over the universe.