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Mar
28
reviewed Leave Open If $dx$ is an infinitesimal, can't you list all real numbers as the sequence each whole number times dx?
Mar
28
reviewed Close Determining which number lies in sequence $1234567891011\ldots$ on the $10^{100005}$'th position
Mar
28
reviewed Leave Open Find the sum of series $\sum_{n=0}^{\infty}\frac{z^{kn}}{(kn)!}$
Mar
28
reviewed Close Solving parametric linear equation
Mar
27
reviewed Close A limit question regarding continuous $f(x)$
Mar
27
reviewed Close If $ f(x) + x^4[f(x)]^3 = 12$ and $f(2) = 2$, find $f′(2)$.
Mar
27
reviewed Leave Open No of right angled triangles
Mar
27
reviewed Close Geometric description of composition of two convex polygons?
Mar
26
reviewed Reviewed Visualizing Frobenius Theorem
Mar
26
reviewed Leave Closed g(x) = 1/(1+x^2) continuous everywhere (is this solution correct)
Mar
26
reviewed Close What is the algorithm to add binary numbers with boolean operations?
Mar
26
reviewed Close Group Theory Research Topics [advice]
Mar
26
reviewed Close top journals in analysis
Mar
26
reviewed Reject I need help finding the radius of convergence along with the interval of convergence
Mar
26
reviewed Close Proof of positive semidefinite projection
Mar
26
reviewed Close How do I prove that sequence of functions in $C[0, 1]$ defined as below is a Cauchy sequence that does not converge in $C[0,1]$?
Mar
26
reviewed Leave Open How to evaluate $\sum_{n=2}^\infty\frac{(-1)^n}{n^2-n}$
Mar
26
reviewed Close Discontinuous function proof using $\epsilon - \delta$
Mar
26
reviewed Close How can I show that $\frac{-1}{2x}(1-\sqrt{1+4x(x+1)})=1$
Mar
25
comment Math of password cracking
Spaces are \, or \;. Your formula looks correct, so if it overestimates then the obvious question is: why do you think it does 4 billion calculations per second? Edit: wait, I may have it. Does your program exit early when it finds the password? Your calculation is the worst case: if the password is generated uniformly and randomly then on average it will take half that time.