vonjd
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 Dec 19 awarded Constituent Dec 9 awarded Caucus Dec 9 awarded Nice Question Dec 4 awarded Popular Question Nov 26 awarded Good Question Oct 30 awarded Notable Question Jul 28 awarded Yearling Jul 24 comment What are some conceptualizations that work in mathematics but are not strictly true? That is better :-) Jul 24 comment What are some conceptualizations that work in mathematics but are not strictly true? But you didn't say that a line has to be straight. Jul 24 comment What are some conceptualizations that work in mathematics but are not strictly true? Whether this is true or not depends on the axiomatic system and how you define "line". Jul 2 awarded Curious Jul 2 awarded Inquisitive Jun 4 awarded Notable Question May 22 comment What's going on in Ito calculus? Could you tell us which books did you find and what exactly is missing there? May 16 asked Why do you need an integral to invert the Z-Transform? May 15 awarded Necromancer May 15 comment Example for finite dimensional analog of integral transforms I tried this with Mathematica and the vector $\{1,2,3,4,5\}$. The result after multiplying with $B(z)$ and transforming back should be $\{1,1,1,1,1\}$ because these are the first differences, right? (I am not sure about the last one, but anyway). Interestingly after multiplying with $B(z)$ I get $\{1,2,3,4,5\}$ and transforming this back gives the discrete delta function times $\{1,2,3,4,5\}$: wolframalpha.com/input/… - what's wrong?!? May 15 comment Example for finite dimensional analog of integral transforms This is exactly what I was looking for! Thank you very much indeed! :-) May 15 accepted Example for finite dimensional analog of integral transforms May 14 comment Example for finite dimensional analog of integral transforms @MattL. Ok, I tried this with vectors but there are still things that don't work out :-( If you gave me an example with the z-transform on vectors where multiplication/division becomes differentiation/integration I would happily accept your answer :-) Thank you