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Sep
16
comment Ambiguity of notation: $\sin(x)^2$
Just worth pointing out that many people have thought the $sin^2$ notation (meaning the square of the sine) senseless for a long time, for example Charles Babbage[0]. I cannot understand how any right thinking person would use it, but many still do. [0] books.google.ie/…
Aug
25
comment Why is there no natural metric on manifolds?
This is a great physics answer.
Aug
16
comment Is there an interval notation for complex numbers?
@alexqwx it's not a matter of being sensible, they mean different things! The former (probably needing round brackets) makes $z$ a complex number, the latter makes it an interval.
Jul
7
awarded  Editor
Jul
7
revised A simple limit problem
the limit isn't the function!
Jul
7
suggested suggested edit on A simple limit problem
Apr
21
answered Continuity and simplification of a function
Apr
6
comment How to prove the quotient rule?
Using exponents on functions like that really looks like functional composition (or inverse) rather than multiplicative.
Feb
4
comment integral from zero to zero
but if $\int_0^0 \delta=1$ then we also have $\int_0^0 \delta=\int_0^0 \delta+\int_0^0 \delta = 2$
May
18
awarded  Critic
Mar
2
answered Finding an explicit expression for a minimizer
Jan
19
awarded  Scholar
Jan
19
awarded  Supporter
Jan
19
accepted Objects of the Category $\mathbf{Mat}_\mathbb K$
Jan
18
comment Objects of the Category $\mathbf{Mat}_\mathbb K$
I mean type in the sense of domain and codomain. The arrows in $\mathbf {FdVect}_\mathbb K$ are linear maps $A:\mathbb K^n-> \mathbb K^m$ which makes sense to me since those the $\mathbb K^n$ are the objects of $\mathbf {FdVect}_\mathbb K$. On the other hand I don't know what it would even mean for something (let alone a matrix) to have domain $n$ and codomain $m$.
Jan
15
awarded  Teacher
Jan
15
comment Integration Substitution
exactly, but I would recommend doing the integrals on paper until you are comfortable with them
Jan
15
answered Integration Substitution
Jan
13
awarded  Student
Jan
13
asked Objects of the Category $\mathbf{Mat}_\mathbb K$