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Jun
6
answered On prime(less)ness and composite(less)ness of 1
Jun
2
reviewed Approve combination GRE problem 25
Jun
2
comment What does “radical cube zero” mean?
For what it's worth, in mathematics, a "dimension" is not something that one can "enter". The dimension of a (vector) space is (roughly) the number of coordinates that it takes to fully specify a point in that space. So whatever references you've found to radical cubes (and I don't know what a radical cube is), it is doubtful that it has anything to do with entering or exiting other dimensions.
Jun
2
comment solve the equation for x
Hello, I've changed your statement of the problem to LaTeX code, which I would recommend learning to get the most out of this site. Can you check to make sure that I've translated correctly?
Jun
2
revised solve the equation for x
added latex
May
28
awarded  Popular Question
Apr
16
revised How do you evaluate $f(x_n)$?
added 87 characters in body
Apr
16
revised How do you evaluate $f(x_n)$?
edited body
Apr
16
answered How do you evaluate $f(x_n)$?
Apr
15
comment Proof by contradiction and order of statements
@Amateur yep. I take it back.
Apr
15
comment Proof by contradiction and order of statements
@Amateur I'm not sure that it's correct to say that $\mathbb{R}$ is a closed interval, although you're certainly right that it's a closed set.
Apr
15
comment Proof by contradiction and order of statements
For your last note, just make a truth table and check.
Apr
15
comment applications of derivatives : maxima and minima
Do you have any thoughts on this? What would it mean if the derivative of a function at a point was $10100$? What would the function look like at that point? Why couldn't that be a maximum?
Apr
15
comment Problem with trigonometric equation
That problem looks pretty tough to solve analytically to me. Where did you come across it?
Apr
15
comment Question about the Continuum Hypothesis
The answer to "where did I go wrong" is that OP took "Clearly this is either true or false - there either exists such a set, or there does not exist such a set" to be true, and this demonstrates that that's not so obvious.
Apr
15
answered Question about the Continuum Hypothesis
Apr
14
reviewed Approve Autocorrelation and spectral density in MATLAB
Apr
14
comment If $x^2 +xy =10$ then when $x=2$ what is $\frac{\mathrm dy}{\mathrm dx}$?
do you mean "when $x=2$"?
Apr
14
answered Let $n\ge 2$ be an integer. If $\gcd(a,b^n)=1$, then $\gcd(a,b)=1$
Apr
14
reviewed Approve Linear Algebra nullSpace and multiplication