Daniel McLaury
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 Apr 26 comment Why don't we use “dx” as the limiting variable when teaching the definition of the derivative with respect to x? Well, we'd be using it to mean both dx in the usual sense and also $\Delta x$. Apr 26 answered Why don't we use “dx” as the limiting variable when teaching the definition of the derivative with respect to x? Apr 26 comment Jordan form generating general vectors vectors Perhaps you were dealing with a case where there were two different Jordan blocks with the same eigenvalue? Apr 25 comment What are some pairs of mathematically-important functions that differ only at a few points? Sure, so long as it's relevant to the spirit of the question. (A bad answer would be something where you have two functions with finite domain that have no particular relation to each other, for instance.) Apr 25 reviewed Leave Open If $\lim_{x\rightarrow\infty}f(x)=0$, does $||f||_{L^2}=0$? Apr 25 reviewed Leave Open Is this definition of Mersenne Primes correct? Apr 25 reviewed Leave Open Can this matrix equation be solved? Apr 25 asked What are some pairs of mathematically-important functions that differ only at a few points? Apr 25 comment Theorems' names that don't credit the right people So far as I know, it can't even be established that a real person named Pythagoras ever lived. Apr 25 reviewed Leave Open Forms of functions in dynamical systems Apr 25 comment Help me understand modular arithmetic(?) One way to do this is using the extended Euclidean algorithm. Apr 25 reviewed Close Prove that there exists an absolute minimum point Apr 25 reviewed Close Limit evaluate calculate Apr 25 reviewed Close Ellipse rotated through an out _of _plane focal line Apr 25 reviewed Close What is meant by the limit of a Cauchy Sequence? Apr 25 reviewed Close Prove $\sin(A-B)/\sin(A+B)=(a^2-b^2)/c^2$ Apr 25 reviewed Leave Open Baseball card collecting probability and use of Markov Apr 25 reviewed Leave Open A point in a closed set in Euclidean Space Apr 25 reviewed Leave Open $A,B \in M_n(\mathbb{R})$ are similar over $\mathbb{R}$ if they are similar over $\mathbb{C}$ Apr 25 reviewed Leave Open How can imaginary f(z) have a maximum or minimium on an open set?