How do you find $x$ when there are also other variables like $P, A, t$ $$P=\frac{A}{1+xt}$$ Here's what I did, I'm not sure if I'm correct LCD: 1 + xt $$1+xt(P=\frac{A}{1+xt})$$ $$(1+xt)P =1+xt(\frac{A}{1+xt})$$ $$P + Ptx = A$$ Is the above correct? I couldn't continue it because I don't kno...

So I'm doing some computer vision, namely a segmentation task with a depth camera and I'm trying to express the way in which pixels are added to specific regions. I'm unsure of the best way to notate this in my report. In general I'm not hugely experienced with maths and I often trip up when it c...

Is there such a thing as 2.3 variables? for example there are system of equations of n variables, but what about when n is not an integer , when n is a real number or even complex number? What about matrix? Is there anything in math that generalises the notion of variable? or even defines it? ...

Aside from the suitability of the question proposed above: In general it is okay to ask about names of things and identifying objects. Please tag them with notation and/or terminology as appropriate.

Your question immediately made me wonder how come there isn't a terminology tag. But then I looked it up and found there is in fact such a tag: http://math.stackexchange.com/questions/tagged/terminology Questions on the usage and meaning of words in mathematics, the names for mathematical e...

Since other "named" tags got mentioned, I would like to make some general remarks first. I see (at least) three different types of tags or tagging involving the name of a mathematician, and I think it is important to keep them separate. The purpose of ask-johnson and ask-noam are to signal ...

The following problem is presented: Prove that, if A and B are singular $n \times n$ matrices, that $A+B$ is also singular. I have the following solution, whereupon I assume that $x_1 = x_3$.