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location UK; Sheffield, Cambridge, London.
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visits member for 3 years
seen 13 hours ago

Jan
18
asked Is there a name for functions “opposite in nature” to orthogonal functions?
Jan
17
comment Examples of orthogonal/orthonormal functions which are not finite degree polynomials?
Ah I see. Is this related to the so-called Schmidt process? (related to Gram-Schmidt by any chance...)
Jan
17
revised Examples of orthogonal/orthonormal functions which are not finite degree polynomials?
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Jan
17
revised Examples of orthogonal/orthonormal functions which are not finite degree polynomials?
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Jan
17
revised Examples of orthogonal/orthonormal functions which are not finite degree polynomials?
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Jan
17
revised Examples of orthogonal/orthonormal functions which are not finite degree polynomials?
edited title
Jan
17
asked Examples of orthogonal/orthonormal functions which are not finite degree polynomials?
Jan
15
revised Is this transformation affine?
edited title
Jan
15
comment How to prove that $\left(\sqrt{3}\sec{\frac{\pi}{5}}+\tan{\frac{\pi}{30}}\right)\tan{\frac{2\pi}{15}}=1$
In general, squaring and applying known trigonometric identities can sometimes be of help. Might not be of help here though.
Jan
13
comment Memory efficient algorithm to find network diameter
So the graph has an embedding in the plane? Or just edge lengths?
Jan
13
comment Memory efficient algorithm to find network diameter
Why would it fill memory? Are you using an object oriented paradigm to represent your graph in memory? BFS of this graph representation has little overhead.
Jan
13
comment How do I find the equivalence of the expression $e^{n\log(n)-(n+e)\log(n + e)}$?
Do you mean you want to find an asymptotic formula for the expression?
Jan
13
comment A fan, a horn, and a snowflake - unusual math terms
The `Golden ratio' $\phi$.
Jan
13
revised The gradient of a distance function.
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Jan
13
comment Integer root of a quadratic
Do you mean over all $a\in\mathbb{Z}$ or just some specific $a\in\mathbb{Z}$ for which $n^2-an+6a=0$ has integer solution(s) $n$ ? If it's a specific $a$ then don't you just need to use the quadratic formula, assuming your integer $a$ gives integer solutions for $n$?
Jan
12
comment Gradient of product of sums
Maybe the product rule? $(u\cdot v)'=u\cdot v'+v\cdot u'$ ?
Jan
11
revised Find appropriate substitution for indefinite integral.
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Jan
8
revised How to calculate $ \int_0^1 \frac{(1+x)^{2r-1}}{1+x^2}dx $?
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Jan
8
revised How to calculate $ \int_0^1 \frac{(1+x)^{2r-1}}{1+x^2}dx $?
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Jan
7
answered How to calculate $ \int_0^1 \frac{(1+x)^{2r-1}}{1+x^2}dx $?