Question

Quadratic fit using sum of least squares without matrices

score 104 · Answer 1 · 2017-10-27 16:29:20

104

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Quadratic fit using sum of least squares without matrices

Published on 27 Oct 2017 - 16:29

score 880 · Answer 2 · 2026-03-25 23:51:30

880

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Riemann Sums as definite integrals

Published on 25 Mar 2026 - 23:51

score 55 · Answer 3 · 2017-11-04 20:34:02

55

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Five Trig Functions who's squares add to a constant?

Published on 04 Nov 2017 - 20:34

score 25 · Answer 4 · 2017-11-07 16:53:04

25

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Nonnegative Polynomials Imply Nonnegative Probability Measure Product?

Published on 07 Nov 2017 - 16:53

score 103 · Answer 5 · 2026-03-25 18:56:26

103

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Is there a geometric realization in integer-sided squares of $70^2 =\sum_{j=1}^{24} j^2 $?

Published on 25 Mar 2026 - 18:56

score 62 · Answer 6 · 2017-11-14 20:14:28

62

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Looking for a reference about a problem on the number of representations of an integer as a sum of two squares

Published on 14 Nov 2017 - 20:14

score 2.2k · Answer 7 · 2017-11-25 03:12:49

2.2k

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Representing a given number as the sum of two squares.

Published on 25 Nov 2017 - 3:12

score 30 · Answer 8 · 2017-11-26 14:01:58

30

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if $\sum_{k=1}^nx_{k}=\sum_{k=1}^{n}x_{k}^2=n$ then forall k, $x_k=1$

Published on 26 Nov 2017 - 14:01

score 92 · Answer 9 · 2017-12-05 18:36:14

92

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Show that $ \# \{ (a,b,c,d) \in \mathbb{Z}^4 : a^2 + b^2 + c^2 + d^2 = m\} \asymp m $

Published on 05 Dec 2017 - 18:36

score 3.4k · Answer 10 · 2017-12-10 04:58:17

3.4k

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sum of 3 squares

Published on 10 Dec 2017 - 4:58

score 136 · Answer 11 · 2017-12-18 04:10:50

Show that the number of solutions of $x^2+y^2 ≡ 1$ (mod $p$) where $0<x<p$, $0<y<p$, $p$ is odd prime is even iff $p ≡ 3, -3$ (mod $8$)

score 38 · Answer 12 · 2017-12-19 15:10:27

38

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Is there reference sheets or techniques to writing numbers as sums of squares?

Published on 19 Dec 2017 - 15:10

score 114 · Answer 13 · 2017-12-20 12:20:38

114

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Integer solutions to $a^{2}+b^{2}+c^{2} = d^{2}+e^{2}+f^{2}$, where $a, b, c, d, e, f \neq 0$

Published on 20 Dec 2017 - 12:20

score 133 · Answer 14 · 2017-12-21 20:22:39

133

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More of this type $T_n^2+T_{n+1}^2+T_{n+2}^2=X^2?$

Published on 21 Dec 2017 - 20:22

score 159 · Answer 15 · 2017-12-28 12:26:00

159

Views

Iterations of $x^2 + y^2$

Published on 28 Dec 2017 - 12:26

List Question

Quadratic fit using sum of least squares without matrices

Riemann Sums as definite integrals

Five Trig Functions who's squares add to a constant?

Nonnegative Polynomials Imply Nonnegative Probability Measure Product?

Is there a geometric realization in integer-sided squares of $70^2 =\sum_{j=1}^{24} j^2 $?

Looking for a reference about a problem on the number of representations of an integer as a sum of two squares

Representing a given number as the sum of two squares.

if $\sum_{k=1}^nx_{k}=\sum_{k=1}^{n}x_{k}^2=n$ then forall k, $x_k=1$

Show that $ \# \{ (a,b,c,d) \in \mathbb{Z}^4 : a^2 + b^2 + c^2 + d^2 = m\} \asymp m $

sum of 3 squares

Show that the number of solutions of $x^2+y^2 ≡ 1$ (mod $p$) where $0<x<p$, $0<y<p$, $p$ is odd prime is even iff $p ≡ 3, -3$ (mod $8$)

Is there reference sheets or techniques to writing numbers as sums of squares?

Integer solutions to $a^{2}+b^{2}+c^{2} = d^{2}+e^{2}+f^{2}$, where $a, b, c, d, e, f \neq 0$

More of this type $T_n^2+T_{n+1}^2+T_{n+2}^2=X^2?$

Iterations of $x^2 + y^2$

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