60,944 reputation
136113
bio website math.ethz.ch/~blatter
location Switzerland
age 79
visits member for 4 years
seen 24 mins ago

Aug
16
answered why area under curve or riemann sum equals to definite integral
Aug
16
comment If a recursive sequence converges, must its inverse be divergent?
I'd call it "reverse".
Aug
16
answered Integrating over Branch Cuts
Aug
16
revised If $f(x) = x^{\alpha}\cdot \ln(x)$ and $f(0)=0$, for which $\alpha$ Rolle's Theorem is applicable?
edited title
Aug
16
comment Finding equation of an ellipsoid
@Semiclassical: See the supplementary example in the answer below.
Aug
16
answered Finding equation of an ellipsoid
Aug
15
comment Why isn't the volume of a sphere $ π^2r^3?$
See here: en.wikipedia.org/wiki/Guldinus_theorem
Aug
15
answered When to Taylor expand in a differential equation
Aug
15
comment Prove $\sin^{2m}\alpha\cdot\cos^{2n}\alpha\leq\frac{m^m n^n}{(m+n)^{(m+n)}}$
What I'd try: Put $\cos^2\alpha=:p$, $\sin^2\alpha=:q$. Then $p$, $q$ are both nonnegative, and $p+q=1$.
Aug
15
answered fundamental period of sum of two periodic functions
Aug
15
answered Consider the mapping $\mathbb{R}^3 (x,y,z)$ to $\mathbb{R}^3(u,v,w)$ given in coordinates
Aug
14
revised How to prove correctness of this algorithm
added 91 characters in body
Aug
14
answered Question on definitions
Aug
14
answered Contour expression explanation
Aug
14
awarded  Necromancer
Aug
14
comment Contour expression explanation
The TA that formulated the problem was lazy. He meant the formal sum of the two segment paths $\sigma(e,1)$ and $\sigma(1,-1+\sqrt{3})$. – Note that you don't need to compute the line integral via a parametrization of these paths. There is an easier way.
Aug
14
revised Arrangements of n pairs of socks on a clothesline
added 334 characters in body
Aug
14
revised How to prove correctness of this algorithm
added 11 characters in body
Aug
13
revised Solving $x^3+y^3=x^2y^2+1$ in non-negative integers
edited body
Aug
13
revised Image of a parametrised curve and its geometrical meaning
deleted 6 characters in body