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seen Oct 21 at 17:31

Jun
22
comment Using differentials
Agreed. When I took my ODE class I just went with it, but as I went back and worked through some of that material years later it occurred to me that the homogeneous equation above is actually a partial differential equation in disguise, of sorts -- hence my addendum with $\frac{dy}{dt}$ (etc). Adding $t$ explicitly seemed to make it easier to 'guess' the solution for those problems.
Jun
22
revised Using differentials
added 561 characters in body
Jun
22
answered Using differentials
Jun
13
accepted Online tools for doing symbolic mathematics
Jun
9
asked Online tools for doing symbolic mathematics
May
16
accepted Convolution & DFTs: How much zero padding is necessary to avoid circular convolution?
May
16
comment Convolution & DFTs: How much zero padding is necessary to avoid circular convolution?
@joriki - Very good point, thank you. If you want to provide the correct answer and that note as part of your answer, I'll accept it.
May
16
comment Convolution & DFTs: How much zero padding is necessary to avoid circular convolution?
Scratch that. The answer is $2N - 1$ along each dimension. See the following: cnx.org/content/m10963/latest
May
16
asked Convolution & DFTs: How much zero padding is necessary to avoid circular convolution?
Apr
28
revised What do $\pi$ and $e$ stand for in the normal distribution formula?
added 7 characters in body
Apr
21
answered Good Book On Combinatorics
Apr
21
comment Is this a positive semi- definite matrix
The OP didn't ask about 2x2 matrices.
Apr
21
comment The 9 Billion Names of God
Although this is an interesting experience, the format of your question is very open-ended. There's no way anyone can give a 'right' answer, and often no answer is selected to be accepted for open-ended questions.
Apr
20
comment Maximization of Two Areas — Calculus 1
I'm a little unsure how to pull this off without another constraint. It seems like a circle is the most efficient shape in terms of containing the most area, so any expression you come up with would force the square's perimeter to zero and give you a circle with circumference = 10 meters.
Apr
19
comment how do you solve $y''+2y'-3y=0$?
@night - That notation is not at all uncommon. I've encountered it in 3 texts for undergrad study, and it's one of the most useful techniques discussed in the differential equations "Problem Solvers" book -- with plenty of examples given, albeit more awkwardly typed.
Apr
12
comment Genetic Algorithms
The next step will be to choose something you want to encode for the algorithm to work with. The two most obvious (only?) things you can model (or use to model) are actions to take within the game, and current/previous game state/actions. One way to handle it could be to use your genetic sequence to weight how important information is about current/previous game states and previous moves, then use some type of weighted sum to determine future moves. The paper you linked to probably describes the encoding they used.
Apr
12
comment Geometric Series - Simple Question
If it's a calculation you want to verify, just plug it into wolframalpha.com
Apr
8
awarded  Critic
Apr
8
comment Rules of Division
@Bill - Well put.
Apr
8
comment Rules of Division
@Bill - No. You made a good argument for a more general treatment of the topic. I'm arguing that there should be a "simplified" treatment as well. My point about the math jargon was to make the point that it doesn't need to be only readable by someone who has a desire to invest themselves in math enough to understand the more general/rigorous treatment.