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4h
comment How to complete this proof? Union of a countably infinite set and a finite set is countably infinite
@Stefan you are probably right...
5h
comment Finding the sum of a series derived by Nernst equation
What is $m_r$ given by? or is there another equation relating $U_r$ and $m_r$?
5h
revised Finding the sum of a series derived by Nernst equation
added 51 characters in body
5h
comment How to complete this proof? Union of a countably infinite set and a finite set is countably infinite
First (why) $|X \cup Y| \ge |X| = +\infty$
5h
revised Percentage change using differentials.
edited tags
5h
answered Percentage change using differentials.
1d
comment How do i show V is a linear subspace if it's defined like this?
What do you need to show is a linear subspace -- $V$ or $T(V)$?
1d
comment Proof of Vandermonde's Identity using a “different approach” using complex integration
yes, i think this is right
1d
comment Proof of Vandermonde's Identity using a “different approach” using complex integration
+1, interesting, i like it
1d
revised confused on to leave in centimeters or convert to cubic centimeters
added 5 characters in body; edited tags
1d
answered confused on to leave in centimeters or convert to cubic centimeters
1d
comment Powers of complex numbers
@Marissa see update
1d
revised Powers of complex numbers
added 339 characters in body
1d
comment Show that f is a density and find the corresponding cdf
@dc3rd of course, if $x > 1$, we define $F(x)=1$...
1d
answered Show that f is a density and find the corresponding cdf
1d
revised Show that f is a density and find the corresponding cdf
deleted 8 characters in body
1d
comment Count the number of strings of length 8 over A = {w, x, y, z} that begins with either w or y and have at least one x
Makes sense to me
1d
revised How to prove that the time constant is equal to -1/k?
added 16 characters in body
1d
comment What is the most complex mathematical topic?
Interesting what makes them the most complex? There are very difficult problems in other areas of math, often hallmarks of entire fields of thought, like $P = NP$ for example. I am not arguing, just want to understand the thinking
1d
comment How do I complete composite functions that use cos(x) and a polynomial?
Please update the problem with what you think should be done and we will be happy to help with hints and suggestions. What does $f(g(x))$ mean?