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Jan
8
awarded  Commentator
Jan
8
comment Is arrow notation for vectors “not mathematically mature”?
Since nobody seems to have mentioned it, if you want to know how to notate something then read books until you find one you like, then copy that.
Dec
31
asked Integrating Factor Solution for Wave Equation
Dec
23
comment Do we really need reals?
I would say that in physics measurements produce distributions, which are then sampled over rationals. That is to say if you measure something with a ruler your result will be something that looks like a Gaussian around whatever you read off the scale, and then you'll say something like "the value is between 0.55m and 0.56m with 95% certainty".
Dec
2
comment Is it possible to simulate a floor() function with elementary arithmetic?
Replace invertible by continuous then.
Oct
5
awarded  Promoter
Oct
2
asked ODEs of the form $a''= -f(b,t) b',\,\,\, b''=f(b,t) a'$
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 approved 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