Sean D
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 Jan8 awarded Commentator Jan8 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. Dec31 asked Integrating Factor Solution for Wave Equation Dec23 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". Dec2 comment Is it possible to simulate a floor() function with elementary arithmetic? Replace invertible by continuous then. Oct5 awarded Promoter Oct2 asked ODEs of the form $a''= -f(b,t) b',\,\,\, b''=f(b,t) a'$ Sep16 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/… Aug25 comment Why is there no natural metric on manifolds? This is a great physics answer. Aug16 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. Jul7 awarded Editor Jul7 revised A simple limit problem the limit isn't the function! Jul7 suggested approved edit on A simple limit problem Apr21 answered Continuity and simplification of a function Apr6 comment How to prove the quotient rule? Using exponents on functions like that really looks like functional composition (or inverse) rather than multiplicative. Feb4 comment integral from zero to zero but if $\int_0^0 \delta=1$ then we also have $\int_0^0 \delta=\int_0^0 \delta+\int_0^0 \delta = 2$ May18 awarded Critic Mar2 answered Finding an explicit expression for a minimizer Jan19 awarded Scholar Jan19 awarded Supporter