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16h
revised Find a pair of integers $n,x$ such that $84 = nx + (n-1)n$ and $x$ is odd
deleted 9 characters in body
20h
comment Cardinality of the set of multiples of “n”
What do you mean "as $n\to\infty$"? Are you implying some kind of limit construction?
1d
comment Largest Equilateral Triangle in a Polygon
I'm not sure about your very first sentence. Couldn't only $2$ or even $1$ be on the edge?
1d
comment Produce unique number given two integers
And indeed, I believe a simple pigeonhole argument should show that a quadratic bound is the best you can hope for.
1d
comment Produce unique number given two integers
If we're talking about a computer, this becomes trickier as soon as $a$ or $b$ get bigger than $64$... not a great range.
Jul
28
comment How can one visualize a homomorphic mapping.
Groups really aren't visual objects...
Jul
28
revised What is the area of a 12cm square?
edited body
Jul
28
answered What is the area of a 12cm square?
Jul
27
answered How to get the answer choice
Jul
27
answered Why relations are defined as the smallest
Jul
27
comment Why relations are defined as the smallest
@dorebell But how do you know the new relation will satisfy that property as well?
Jul
27
comment Why relations are defined as the smallest
There isn't "a smallest relation" (unless you count the empty relation), there is a "a smallest relation satisfying $P$", where $P$ is some property. The proof that such a thing exists will depend on what $P$ is. I think you should provide a few examples you've found where relations are defined being the smallest, because why the author does that probably depends on context.
Jul
25
comment Proving properties of closures using intersection of indexed sets and topology
When your question is about a specific problem, it's best to summarize it in the title, or at least indicate that it's about a specific problem. "Question about writing proofs with sets" sounds like a general question on methodology.
Jul
15
comment Trailing zeroes on factorial?
Nevermind, I interpreted your statement "it has 20 multiples of 5" as "it has 20 multiples of 5 which are not multiples of 25".
Jul
15
comment Trailing zeroes on factorial?
Shouldn't that be $5^{28}$? Also, I'm not quite sure the "clearly" at the end is quite so clear.
Jul
14
comment Please give me an example of the algorithm where $\Theta$ will be equal to $e^n$
"Missing context or other details"... For God's sake you bunch of knee-jerkers, what kind of "context" are you looking for here? Would the question really be any better with a paragraph of exposition on what led the OP to ask this question?
Jul
14
comment Explaining Infinite Sets and The Fault in Our Stars
As @user18921 pointed out, it's clear the author is talking about a more "set oriented" concept of "size". He doesn't explicitly state that he's using cardinality, but it's clear he's not talking about Lebesgue measure. However, he could easily be implicitly talking about ordering sets by inclusion.
Jul
12
revised Finding a series of common multiples given arbitrary numbers
added 41 characters in body
Jul
12
comment Finding a series of common multiples given arbitrary numbers
@CMCDragonkai I'm simply dividing an arbitrary common multiple by $m$. $r$ must also be a common multiple because $qm+r$ is, and $qm$ is (because $m$ is), thus subtracting the two we must get another common multiple.
Jul
11
comment Understanding mathematical texts
I generally consider that I understand a theorem when it seems obvious to me. Of course, sometimes the definition of "obvious" needs to be relaxed a bit... but at the very least I want the proof method to seem obvious.