CD - the upvotes have no apparent reason

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opiniont about this old post ,please ! Technically, it probably makes sense to speak of a $0\times 0$-matrix , but it is a weird idea and probably quite useless.

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C/D PSQ & likely dupe

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CD

@Peter There is even the concept of the determinant of an empty matrix. I have no problems with it. As the value of an empty sum or an empty product, it can be useful e.g. in recursion formulas. Just my 2 ct.

A good point you mentioned ! If we consider the empty product, the result is $1$. If we consider the empty sum (of empty products) , the result is $0$. Which is considered to be the "determinant" ?

According to the thread that I linked to, the determinant of the empty matrix is equal to one.

[ SmokeDetector | MS ] Mostly non-latin title (80): Prove that 𝑙𝑛(𝑥+𝑦)<𝑙𝑛(𝑥+𝑦/𝑥) if 𝑥>0,𝑦>0.‭ by Vaishnavee Lad‭ on math.SE

What is the proper reason to close this ? Missing context ?

@Peter I admit that this may not be a good reason, but I think that to begin a text-only question with the words “The result is in the picture…” strongly suggests that this (except for the note and the observation) was the result of COPY + PASTE.

[ SmokeDetector | MS ] Link at beginning of body (40): Question about the usage of the min(x,y) within a demonstration‭ by Diogo‭ on math.SE

delete 1, 2

elementary-set-theory I closed this question as a duplicate in a way which may be seen as self-serving. I would appreciate input: is the dupe target reasonable? If not, is there a better dupe target? If not, should I reopen the question? Clarification of set notation for integer multiples and concept.‭ - Lex‭ 2022-01-31 19:03:49Z

These two questions seem to be near duplicates: math.stackexchange.com/q/3299315 and math.stackexchange.com/q/890341 . Assuming that they are close enough, which way should the duplication go?