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 Sep 24 awarded Autobiographer Apr 21 awarded Informed Oct 21 comment Is this probability question wrong to begin with? My reasoning would be along the lines that the answers given do not pertain to the question, and any mulitple choice question with 4 answers gives you a $25$% chance. So both A and D would be acceptable answers. Good question in general, though! (+1) Oct 2 reviewed Reviewed Bijective conformal map example Oct 2 reviewed Reviewed How can I create an expression that uses numbers 1 - 7 to equal 100? Sep 27 awarded Citizen Patrol Sep 27 revised Consider the function $f(x)= 0$ if $x≤0$ and $f(x)=e^{-1/x^2}$ if $x>0$. Prove that $f$ is infinitely differentiable on $\mathbb{R}$ Tag Changes Sep 27 suggested approved edit on Consider the function $f(x)= 0$ if $x≤0$ and $f(x)=e^{-1/x^2}$ if $x>0$. Prove that $f$ is infinitely differentiable on $\mathbb{R}$ Sep 26 comment Showing a vertical tangent exists at a given function. as a side note, if you would like to learn LaTeX, there exists a very helpful guide here on our meta site. There is also a stack.exchange site for TeX and LaTeX called tex.stackexchange if you have any questions or would like to go into specifics about it. Sep 23 revised Relations between the roots of a cubic polynomial Rewrote picture in TeX and removed image. (Sorry the tags aren't square brackets!) Sep 23 suggested approved edit on Relations between the roots of a cubic polynomial Sep 22 comment Can I keep adding more dimensions to complex numbers? The properties of the number $i$ don't "break" the properties of the real numbers, they expand on them in a way that allows for square roots of negative numbers to be actual values. Sep 21 awarded Custodian Sep 18 awarded Analytical Sep 18 awarded Enthusiast Sep 16 comment Using the integral definition This wikipedia page might help you... Sep 16 reviewed Reviewed Help Converting Octal to Decimal Sep 16 reviewed Reviewed Area of twisted torus Sep 11 awarded Civic Duty Sep 10 awarded Critic