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Dec
10
comment Consider the wave equation
Presumably, you have some notes that tell you what the d'Alembert procedure is, and how to use it, so why not tell us what you know about the problem, how you start out, where you get stuck, and so on?
Dec
10
comment Why is a singular matrix rare?
Nope, no closer to understanding what you mean by "well-ordered up to a multiple of $n$," but very close to concluding that you don't understand what you mean by that phrase, either.
Dec
10
revised Making a $1,0,-1$ linear commbination of primes a multiple of $1000$
more informative title
Dec
10
comment Definite integral against a weight function
I have edited in a more informative title. I'm not certain I've captured the essence of the question. I encourage improvements.
Dec
10
revised Definite integral against a weight function
more informative title
Dec
10
answered Based on a sequence of numbers in a recurrence relation, how can one make a reasonable guess what the underlying degree is?
Dec
10
comment Eigenvectors of similar matrices
It's false. Exercise: come up with an example. Almost any pair of similar $2\times2$ matrices will do.
Dec
10
comment Convert $r^2-5r+6=0$ to a rectangular coordinates
Polar to rectangular --- do you know formulas for $r$ and $\theta$ in terms of $x$ and $y$?
Dec
10
comment Are these two eigenvectors equivalent? (Easy Question)
@Ahsan, up to multiplication by a nonzero constant.
Dec
10
comment Why is a singular matrix rare?
So, now it says, "each row is well-ordered up to a multiple of $n$," thereby raising my not-understanding to a new level.
Dec
10
comment Making a $1,0,-1$ linear commbination of primes a multiple of $1000$
Good. Now you can post a complete solution here. After a while, you can even accept your own solution.
Dec
10
comment Making a $1,0,-1$ linear commbination of primes a multiple of $1000$
I'm intentionally leaving some work for you to do. Don't you want the pleasure of solving a problem on your own?
Dec
10
answered Uniqueness of inverse matrix and possibility of $P=PX$
Dec
10
answered Find three integers $a,\, b,\,$ and $c$ such that $\sqrt{a^2+b^2}$, $\sqrt{a^2+c^2}$, $\sqrt{c^2+b^2}$, and $\sqrt{a^2+b^2+c^2}$ are all integers.
Dec
10
comment Why is a singular matrix rare?
What does "Each row is well-ordered up to a multiple of five" mean?
Dec
10
comment five true or false questions on abstract algebra
5 is true, but I don't think Fermat is involved. 4 is false, but I don't know what the circle group is --- if its the group of rotations of the circle, it certainly has elements of infinite order.
Dec
10
answered Making a $1,0,-1$ linear commbination of primes a multiple of $1000$
Dec
10
answered Why is a singular matrix rare?
Dec
10
answered Finitely Generated Abelian Group
Dec
10
revised Integrability of Derivative of a Continuous Function
typo in title