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Dec
17
comment Parenthesis vs brackets for matrices
Welcome back, @BillDubuque!
Dec
14
comment “Well defined” function - What does it mean?
Fair enough, but it looked like you were trying to teach above... =)
Dec
14
comment “Well defined” function - What does it mean?
@Ami: yes, but don't you think you should verify that for yourself?
Nov
20
comment Why Euler relation $\;e^{(ix)}=\cos(ix)+\sin(ix)\;$ can be writen as $\;e^{ix}=\cos(x)+i\sin(x)$?
Also, $e^x \neq \sin(x) + \cos(x)$...
Nov
20
comment Counting - puzzle question
When you put in that way, this "Devil" character sounds like a real jerk!
Nov
19
comment Does $\langle(4,4,4),(1,2,2)\rangle=\langle(1,2,1),(1,0,1)\rangle$?
Your sentence starting with "For instance... is sufficient to prove that the claim is false. Why bother with all the other stuff?
Nov
19
answered Prove that if $A \setminus B = \emptyset$, then $A \subseteq B$
Nov
19
comment Fundamental Theorem of Trigonometry
Unless you're feeling particularly stingy with your mouse clicks, you can give a "check" to comments...
Nov
16
comment Why can't you square both sides of an equation?
Oh please - anything but that...
Nov
16
comment Proving Fermat's last theorem
I think the proof is in one of the "Related" links -->
Nov
15
comment Evaluating the Average value of f(x)
$\ln$ is an antiderivative of $1/x$.
Nov
14
comment What is the square root of 1 cm
What unit equals a meter when squared?
Nov
14
comment How many positive 4-digit integers are there?
@Atul: for someone with a profile that says "please delete me", you sure are active!
Nov
14
revised The tangent to the curve $y=x^2+1$ at $(2,5)$ meets the normal to the curve at $(1, 2)$
added 14 characters in body
Nov
14
comment The tangent to the curve $y=x^2+1$ at $(2,5)$ meets the normal to the curve at $(1, 2)$
Of course! Time for more coffee :)
Nov
14
answered The tangent to the curve $y=x^2+1$ at $(2,5)$ meets the normal to the curve at $(1, 2)$
Nov
13
comment Prove that $n^n$ is not divisible by $n!$
If two numbers don't have the same divisors, then they are not equal.
Nov
13
comment How dividing a number with 5 gives no. of multiples of 5 from one till that number?
Granted, the OP asked of this would work for any number, so maybe it's worth keeping!
Nov
13
comment How dividing a number with 5 gives no. of multiples of 5 from one till that number?
There are twelve numbers "between" $1$ and $12$...
Nov
13
comment Puzzle with some sort of math meaning to it?
I vaguely remember seeing something like this graph, but it was for testing divisibility by (some certain number). Does anyone now what I'm referencing/forgetting?