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13h
revised Show $\sin(x+h) \cdot \cos x - \cos(x+h) \cdot \sin x = \sin h$ (without limits please - straight trigonometry only).
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13h
comment Integral of Sinc Function Squared Over The Real Line
Very good link. Isn't the integrand an even function?
14h
revised limits proof of vector funcions using (ε,δ )-definition of limit
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14h
comment floor function identity
Dear Smai, do you know any article, book or... in which we can have almost all about the floor function and its properties? (+1)
14h
revised Is floor function an algebraic function?
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14h
revised Is division allowed in rings and fields?
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14h
revised Is stereographic projection the only way to make a bijection between plane and sphere?
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14h
comment Find arc length of curve on the given interval
@amWhy: Thanks. By the way, have you seen a question in which we have almost all about the floor function? I am preparing a good reference for my students in which they can find good properties about this special function. Thanks for any links.
14h
comment Number of Automorphisms on group
@codeomnitrix: By $\phi$, I meant the Euler's phi function in which we can find the numbers which is coprime to 12.
1d
comment Meaning of a set in the exponent
$n\to\{0,1\}{}{}{}{}$
1d
revised Integral's Closed-form expression in terms of hypergeometric function
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1d
revised Constructing a group automorphism making a diagram commute
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1d
revised How to check for convexity of function that is not everywhere differentiable?
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1d
revised The number of distinct conjugates of a $p$-subgroup
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2d
comment Single Variable Calculus Reference Recommendations
I have learned more about Calculus from this old one: Modern Calculus and Analytic Geometry. If you like, please add it to above. :-)
2d
revised In $\mathbb{Z}/(n)$, does $(a) = (b)$ imply that $a$ and $b$ are associates?
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2d
comment Find a solution to $y''-4y'-5y=2e^{2t}$ using variation of parameters
(+1) Well done Mary.
2d
answered Abelian group and morphism equivalent statement
2d
comment Manifolds, charts and coordinates
@silvrfück: I know an example in R^2 which is covered by a single chart.
2d
revised Integral of $1/[(1+x^2)\sqrt{1+x^2}]$
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