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8h
awarded  Nice Answer
14h
answered Where does the proof of $\sqrt 2$ is irrational break down when trying to prove the same for $\sqrt 4$?
14h
comment Books with proving stuff. Any suggestions.
This book is available on Amazon for $20 US used. Its reviews are about evenly split between one and five stars - nothing in between.
14h
comment Changing order of summation including a min in the summation
They would be the same. The parts of the terms that only involved v could be moved outside the inner summation.
14h
answered Aren't there obvious patterns in the primes that no one makes use of and what about this…
14h
answered Changing order of summation including a min in the summation
1d
comment definition of largest circle containing in a convex body
Is there a B for which the two are different?
1d
comment Divisibility of $6^{2^n}+ 8^{2^n} +12^{2^n}+14^{2^n}+16^{2^n}+18^{2^n} +24^{2^n} +28^{2^n}+42^{2^n}$
I always interpret FLT as Fermat's Last Theorem.
1d
comment Finding the sum of special multiplications
Can you go by induction from k to k+1?
1d
asked A conjecture about “equiharmonic numbers” of Flajolet via Doron Zeilberger
2d
comment How to find out the recursive formula for tromino tiling of a 3 × n rectangle
What happens when you add one column so it becomes 3 x n+1? Which cases are based on 3 x n, 3 x n-1, and 3 x n-2. Use this analysis to generate a recurrence.
2d
comment Why x by x is NOT equal to squared x within exponents?
That's only true if $x$ is an integer. The equation above it is true because of the laws of exponents.
2d
revised Show that $\ln(1+x)\leq x-{1\over 2}x^2+{1\over 3}x^3$.
Additional info
2d
answered Show that $\ln(1+x)\leq x-{1\over 2}x^2+{1\over 3}x^3$.
2d
comment How to Find the Function of a Given Power Series?
Somehow, I don't think that helps much.
2d
comment How to Find the Function of a Given Power Series?
Very nice use of that identity, which I had forgotten.
Apr
23
comment Bonus integration problem we got at class: Integrate $\frac {x \sin x}{1+\cos^2x}$ between $0$ and $\pi$
Agree. I have been occasionally downvoted. When I think it is unwarranted, I say so.
Apr
23
comment Bonus integration problem we got at class: Integrate $\frac {x \sin x}{1+\cos^2x}$ between $0$ and $\pi$
Oh well, you (and I) can afford it. Your 153k is awesome. I know that up and down votes are anonymous, but I think it would be nice to see if a large number of down votes come from one person. The identity of that person would still be unknown.
Apr
22
revised Proof $\text{Si}(n) $ is convergent
additional info
Apr
22
answered Proof $\text{Si}(n) $ is convergent