List questions from definition

Published on 14 Apr 2026 - 5:34

279

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how can a define that a function is neither even nor odd without using negation words or symbols?

Published on 17 Apr 2026 - 15:29

86

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What is wrong with this definition of a discrete random variable?

Published on 08 Apr 2026 - 16:48

632

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Implication in the $(ε,δ)$-definition of limit

Published on 09 Apr 2026 - 20:20

238

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Is a subrepresentation just a subspace, or a representation itself?

Published on 12 Apr 2026 - 12:37

116

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If $ X=\bigcup\limits_{i\in I}U_i$ and $X= \bigcup\limits_{i=1}^nU_i$ ($X$ is compact), then $\bigcup\limits_{i\in I}U_i= \bigcup\limits_{i=1}^nU_i$?

Published on 16 Apr 2026 - 1:16

444

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definition of closure and circuit of a matroid

Published on 26 Mar 2026 - 12:38

40

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Is there a formal way to define $\mathbf{R}(X^n)$

Published on 15 Apr 2026 - 16:38

71

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Full and faithful functors

Published on 13 Apr 2026 - 9:57

2k

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In what context would one think a cone surface is not a smooth manifold?

Published on 11 Apr 2026 - 4:18

1.2k

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Why is the topology on $\mathbb R$ always defined to be the set of "open" sets?

Published on 15 Apr 2026 - 18:25

538

Views

What do call this unit vector?

Published on 13 Apr 2026 - 3:24

444

Views

Conic hull of the columns of a positive matrix

Published on 13 Apr 2026 - 15:03

79

Views

Does this weakening of split monomorphism have a name?

Published on 10 Apr 2026 - 1:28

40

Views

notation clarifications

Published on 27 Mar 2026 - 16:53

List Question

What does $\left|B\right|$ mean?

how can a define that a function is neither even nor odd without using negation words or symbols?

What is wrong with this definition of a discrete random variable?

Implication in the $(ε,δ)$-definition of limit

Is a subrepresentation just a subspace, or a representation itself?

If $ X=\bigcup\limits_{i\in I}U_i$ and $X= \bigcup\limits_{i=1}^nU_i$ ($X$ is compact), then $\bigcup\limits_{i\in I}U_i= \bigcup\limits_{i=1}^nU_i$?

definition of closure and circuit of a matroid

Is there a formal way to define $\mathbf{R}(X^n)$

Full and faithful functors

In what context would one think a cone surface is not a smooth manifold?

Why is the topology on $\mathbb R$ always defined to be the set of "open" sets?

What do call this unit vector?

Conic hull of the columns of a positive matrix

Does this weakening of split monomorphism have a name?

notation clarifications

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