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11h
answered There exist a set $X$ such that the number of function $y: x\to \{1,2,3\}$ is $1000$.
11h
revised Are circles and lines in two-space one-dimensional?
deleted 2 characters in body
11h
answered Are circles and lines in two-space one-dimensional?
19h
answered An introduction to algebraic topology from the categorical point of view
1d
comment Generalize a result to any category.
I'm sorry, but I don't know what you are asking.
1d
comment Generalize a result to any category.
do you mean to say: "given an adjunction, the function \tau_{X,Y} is a bijection"? if all you have are the two categories, then there is no function $\tau$. If you mean to start with an adjunction, then the function \tau is, by definition of adjunction, a bijection, natural in each argument.
1d
comment Generalize a result to any category.
that is hardly any more explicit. Please state the result as a theorem. State what is given, and what is the claim. Then we can proceed.
1d
comment Generalize a result to any category.
It's unclear which result you are trying to generalise. All I see is general mumbo jumbo about left-right adjoints. Can you state the result you are looking at explicitly?
2d
comment Elementary question in Group Theory with less prerequisite
@Groups I don't see a quick and super elementary way out of that situation.
2d
comment Elementary question in Group Theory with less prerequisite
If all elements $g\ne e$ have order $5$, then the size of the group must be of the form $4n +1$, of which $15$ is not. No need to invoke normality.
May
22
comment Is an non-invertable matrix an linear operator?
once bases are chosen, any matrix induces a linear transformation (of course the dimensions need to match).
May
22
comment Brouwer fixed-point theorem on non-convex sets
your question (I believe) is discussed in detail in math.stackexchange.com/questions/323841/…
May
22
comment On the properties of an interesting set on the real line…
"every element of $K$ has a unique decimal representation" is hardly an interesting property. The other properties you mention are of some interest, but you will have to find some really fabulous properties of your set to merit any further discussion. Also, the fact that your set depends on a decimal expansions diminishes its quality.
May
21
reviewed Close Calculus: Velocity and Acceleration Question
May
21
reviewed Close Demonstrate that the two formulae for a scalar product are equivalent.
May
21
reviewed Close How to solve the following equation (xlog)?
May
21
reviewed Close Is the product of $n$ Normal distributions also a normal distribution?
May
21
reviewed Close Tennis probability question
May
21
reviewed Close How can I answer this counting question correctly?
May
21
reviewed Close Way to measure the similarity/difference of 2D point clouds