List questions from quantifiers

Published on 21 Oct 2020 - 19:59

65

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Compound quantifiers

Published on 21 Oct 2020 - 20:16

50

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Counterexample? Other Alternative proofs?

Published on 22 Oct 2020 - 2:02

37

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Confused about negation.

Published on 22 Oct 2020 - 18:58

71

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An flawed proof about quantifiers

Published on 23 Oct 2020 - 6:23

55

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Quantifiers solution writing

Published on 23 Oct 2020 - 10:09

60

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existential quantifier of an equivalence

Published on 24 Oct 2020 - 12:14

3.7k

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Why is $\exists x \forall y (x+y=0)$ false?

Published on 26 Oct 2020 - 19:39

122

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Locating the set in the arithmetic hierarchy

Published on 27 Oct 2020 - 21:10

239

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Show that a class of structures is existentially axiomatisable iff it is closed under taking superstructures

Published on 28 Oct 2020 - 23:12

207

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Describe finite structure up to isomorphism as model of two sentences.

Published on 28 Oct 2020 - 23:53

16

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If $R$ is $\Sigma_n$ and $(x,y)\in A\iff (\forall z < y) R(x,y,z)$, then $A$ is $\Sigma_n$

Published on 29 Oct 2020 - 20:45

34

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Confusion about writing $Inf$ as a $\Pi_2$ set

Published on 29 Oct 2020 - 21:54

83

Views

Definition of free and bound variables in relation to specific formulas

Published on 29 Oct 2020 - 23:01

97

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Existential Notation: Is "$\exists mn$" the same as "$\exists m\exists n$"?

Published on 01 Nov 2020 - 10:24

List Question

Universal generalization requirement

Compound quantifiers

Counterexample? Other Alternative proofs?

Confused about negation.

An flawed proof about quantifiers

Quantifiers solution writing

existential quantifier of an equivalence

Why is $\exists x \forall y (x+y=0)$ false?

Locating the set in the arithmetic hierarchy

Show that a class of structures is existentially axiomatisable iff it is closed under taking superstructures

Describe finite structure up to isomorphism as model of two sentences.

If $R$ is $\Sigma_n$ and $(x,y)\in A\iff (\forall z < y) R(x,y,z)$, then $A$ is $\Sigma_n$

Confusion about writing $Inf$ as a $\Pi_2$ set

Definition of free and bound variables in relation to specific formulas

Existential Notation: Is "$\exists mn$" the same as "$\exists m\exists n$"?

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