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  • 45 votes cast
Jun
10
comment What is a Hilbert space?
No I don't to be honest. I think a vector is a two dimensional list of numbers.
Jun
10
comment What is a Hilbert space?
I looked at the Wikipedia article but was left bemused by "A vibrating string can be modeled as a point in a Hilbert space. The decomposition of a vibrating string into its vibrations in distinct overtones is given by the projection of the point onto the coordinate axes in the space."
Oct
30
comment What is $dx$ in integration?
What do you mean by dimensionally correct?
Oct
10
comment Sum of the Reciprocal of the Difference of Two Squares
What is a closed-form expression? +1 by the way.
Oct
1
comment What Does it Really Mean to Have Different Kinds of Infinities?
Why can't lecturers at Uni explain things in this way?
Sep
20
comment What are imaginary numbers?
I thought i = squareroot(-1)
Sep
20
comment What are imaginary numbers?
I don't get it.