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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?