Question

Checking relation symmetry confusion

score 37 · Answer 1 · 2026-04-02 17:36:42

37

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Checking relation symmetry confusion

Published on 02 Apr 2026 - 17:36

score 18 · Answer 2 · 2026-03-20 15:46:36

Is the following binary relation transitive?: (x,y)R(u,v) iff x*y - u*v ≥ 1, where R represents at least as good as.

score 102 · Answer 3 · 2023-05-21 16:48:36

102

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Bijective-like mapping that is not a functon

Published on 21 May 2023 - 16:48

score 42 · Answer 4 · 2023-05-21 18:54:11

42

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Is this relation analysis correct?

Published on 21 May 2023 - 18:54

score 36 · Answer 5 · 2026-03-26 01:28:36

36

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Are upward directed set equivalent to downward directed set ? Example with $\supseteq$ and its dual relation $\subseteq$

Published on 26 Mar 2026 - 1:28

score 110 · Answer 6 · 2026-04-02 17:31:05

110

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Why do we need to include reflexivity in the definition of an equivalence relation?

Published on 02 Apr 2026 - 17:31

score 57 · Answer 7 · 2026-04-02 17:32:46

Prove that $R$ is an equivalence relation where $ R:N\times N \to N $ defined as $(a,b) R (c,d)$ if and only if $ad(b+c) = bc(a+d).$

score 63 · Answer 8 · 2023-05-26 17:54:50

63

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Can I write R+ {0} instead of 0, infinity

Published on 26 May 2023 - 17:54

score 58 · Answer 9 · 2026-03-28 06:09:05

58

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How to intuitively think about composition of relations?

Published on 28 Mar 2026 - 6:09

score 44 · Answer 10 · 2026-04-02 19:14:52

44

Views

Let $R$ be a relation on Cartesian product $\mathbb N \times \mathbb N$ where $(x,y)\mathrel R(u,v)$ iff $xv - yu = 1$.

Published on 02 Apr 2026 - 19:14

score 79 · Answer 11 · 2023-05-27 19:20:26

79

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Does $(x\in A\land y\in B)$ follow from $xRy$?

Published on 27 May 2023 - 19:20

score 43 · Answer 12 · 2026-04-02 19:18:58

43

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Find the equivalence class of a cartesian product.

Published on 02 Apr 2026 - 19:18

score 33 · Answer 13 · 2023-05-28 13:11:08

33

Views

Definition of well defined operation

Published on 28 May 2023 - 13:11

score 47 · Answer 14 · 2023-05-29 17:58:47

47

Views

Is a reflexive relation on the set of real numbers infinite?

Published on 29 May 2023 - 17:58

score 55 · Answer 15 · 2026-03-30 05:28:44

55

Views

Are determinants the only surjective homomorphism from matrices to the reals?

Published on 30 Mar 2026 - 5:28

List Question

Checking relation symmetry confusion

Is the following binary relation transitive?: (x,y)R(u,v) iff xy - uv ≥ 1, where R represents at least as good as.

Bijective-like mapping that is not a functon

Is this relation analysis correct?

Are upward directed set equivalent to downward directed set ? Example with $\supseteq$ and its dual relation $\subseteq$

Why do we need to include reflexivity in the definition of an equivalence relation?

Prove that $R$ is an equivalence relation where $ R:N\times N \to N $ defined as $(a,b) R (c,d)$ if and only if $ad(b+c) = bc(a+d).$

Can I write R+ {0} instead of 0, infinity

How to intuitively think about composition of relations?

Let $R$ be a relation on Cartesian product $\mathbb N \times \mathbb N$ where $(x,y)\mathrel R(u,v)$ iff $xv - yu = 1$.

Does $(x\in A\land y\in B)$ follow from $xRy$?

Find the equivalence class of a cartesian product.

Definition of well defined operation

Is a reflexive relation on the set of real numbers infinite?

Are determinants the only surjective homomorphism from matrices to the reals?

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