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corey1234:
Group Title
Imagine a boxcar with a lamp on the left end and a mirror on the right end, so that a light signal can be sent down and back. The boxcar is …
 updated 6 months ago
 1 reply
 No Medals Yet
Mathematics

corey1234:
Group Title
If it is the GRAPH of a function from A to B that is a subset of A x B, then why do websites say that a function f is a subset of A x B? S…
 updated one year ago
 3 replies
 No Medals Yet
Mathematics

corey1234:
Group Title
Can the codomain of a function not include image points that are in the range. For instance, f: R> [0,Infinity) where f(x)==x. See the co…
 updated one year ago
 1 reply
 1 Medal
Mathematics

corey1234:
Group Title
For the function f(x)==2x, I get why the inverse function is f^1(y)==y/2, but why is it ok to write it equivalently as f^1(x)==x/2? x and …
 updated one year ago
 9 replies
 2 Medals
Mathematics

corey1234:
Group Title
For the operation (a,b)*(c,d)=(acbd, ad+bc), on the set R X R with the origin deleted, is there an inverse element for every (x,y) in that …
 updated one year ago
 4 replies
 No Medals Yet
Mathematics

corey1234:
Group Title
When we talk about the set of ordered pairs (x,y) in the real number set, can x=y? It seems like (x,y) means that x and y are distinct.
 updated one year ago
 3 replies
 2 Medals
Mathematics

corey1234:
Group Title
Ok. I have a very hard question. Hopefully someone here can solve it. Now for binary operations, well I have one here, and I need to know if…
 updated one year ago
 2 replies
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Mathematics

corey1234:
Group Title
Ok. I have a very hard question. Hopefully someone here can solve it. Now for binary operations, well I have one here, and I need to know if…
 updated one year ago
 6 replies
 No Medals Yet
Mathematics

corey1234:
Group Title
Ok. I have a very hard question. Hopefully someone here can solve it. Now for binary operations, well I have one here, and I need to know if…
 updated one year ago
 36 replies
 1 Medal
Mathematics

corey1234:
Group Title
For mass volume density, why is it that when you make delta v go to 0, delta m would vary discontinuously?
 updated one year ago
 2 replies
 1 Medal
Mathematics

corey1234:
Group Title
I have a question about existence and uniqueness. It says that if f(x,y)=dy/dx and partialf/partialy are both continuous on the xy plane, th…
 updated one year ago
 1 reply
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Mathematics

corey1234:
Group Title
Why is it that the derivative of y=f(x) with respect to y is 0? Such as the derivative of y=x with respect to y..which is 0.
 updated one year ago
 3 replies
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Mathematics

corey1234:
Group Title
In a sea of aluminum atoms...each aluminum atom gives up three valence electrons to the sea of free moving conduction electrons...and the me…
 updated one year ago
 2 replies
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Mathematics

corey1234:
Group Title
For the diff eq. (dy/dx)=(1y)/x, I see that it is not continuous or defined at x=0. however, if you graph the solution y=cx+1, then you get…
 updated one year ago
 3 replies
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Mathematics

corey1234:
Group Title
Why do only nonzero eigenvalues have eigenvectors in the image?
 updated one year ago
 5 replies
 3 Medals
Mathematics

corey1234:
Group Title
Hi. I have a question concerning mainly the idea of notation of dimensions. So we say that R2 is a 2 dimensional vector space. It can hold f…
 updated 2 years ago
 2 replies
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Mathematics

corey1234:
Group Title
Why are we able to think of column matrices as vectors? For instance, X(1,2,3) (assume the column matrix was vertical). If I wanted to draw …
 updated 2 years ago
 4 replies
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Mathematics