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Jan
22
comment How, if at all, does pure mathematics benefit from $2^{74207281}-1$ being prime?
+1 for a good answer, and a blast from the (MMF) past!
Jan
20
comment How to write a definition of less than $<$?
There's nothing terribly wrong with the word - it just seemed funny that a word with such finality would be used to demonstrate $3 < 5$, a fact almost irrelevant to the task at hand.
Jan
19
comment How to write a definition of less than $<$?
"finally" - ???
Jan
19
comment How to write a definition of less than $<$?
No. You are using the < in its own definition!
Jan
19
comment Why can't you have more turning points than the degree?
"There are four [real] roots, so the degree is at least $4$..."
Jan
19
comment GRE Algebra answer is wrong
@user247327: The original post said no such thing: math.stackexchange.com/revisions/1617611/1
Jan
19
comment GRE Algebra answer is wrong
Surely the percent sign is a typo!
Jan
19
revised GRE Algebra answer is wrong
added 170 characters in body
Jan
19
answered GRE Algebra answer is wrong
Jan
19
answered Given two vertices of a rhombus A(-3, -1) and B (9, 5) on opposite ends of a diagonal, what are the other two coordinates?
Jan
14
comment Probability to win a chance game
en.wikipedia.org/wiki/Hypergeometric_distribution
Jan
13
comment Showing that $\mathbb{Z}\cap(-10, 10)$ is open in $\mathbb{R}$
I can't say exactly, but it's very small!
Jan
8
comment Value of $a^2 + b^2$ given $a^3 - 3ab^2 = 44$ and $b^3 - 3a^2 b = 8$
@S.Mo - hah! My mistake. Well if you do find the OP, please direct them to my comment :)
Jan
8
comment Value of $a^2 + b^2$ given $a^3 - 3ab^2 = 44$ and $b^3 - 3a^2 b = 8$
@S.Mo - maybe some further insight on the context of this question (i.e. where did you find it??) would help us help you
Jan
5
comment Differentiating $0.5\sin⁡(2t-\pi/2)$
Part of your misunderstanding might be related to your calling 48x^2 a FUNCTION - it is an expression. $$f(x) = 48x^2$$ is a function! The function you're given is a few steps away. First, it's a more complicated function. Second, the variable is different, which might trip you up.
Jan
5
comment How to differentiate both sides with an independent variable if one doesn't have a formula?
What is the actual equation that you have?
Jan
5
comment Verify the following identities
The principal is the same - we introduce exercises before fully developing the theory.
Jan
5
comment Verify the following identities
@djechlin - you've never seen the statement "the proof of this theorem is beyond the scope of this class"? Or maybe you've never taken a class where the rote exercise of "trig proofs" was taught...
Jan
5
comment BODMAS riddle - which is correct?
"Is there a reason for this?" - yes, it is a standard. In theory, everyone adhering to the standard will arrive at the same result given the same starting point.
Jan
5
comment BODMAS riddle - which is correct?
"I fully understand the order of BODMAS" ...