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Aug
18
accepted Geometric interpretation of parallelogram law determines the inner product
Aug
18
accepted The inner product determines the structure of the space
Aug
17
comment Best approximating linear polynomial for $|x|$ on $[-1,5]$
@900sit-upsaday why we choose these three points.
Aug
17
comment Best approximating linear polynomial for $|x|$ on $[-1,5]$
@900sit-upsaday edited ,sorry
Aug
17
comment Best approximating linear polynomial for $|x|$ on $[-1,5]$
@MPW edited, sorry for that
Aug
17
revised Best approximating linear polynomial for $|x|$ on $[-1,5]$
added 13 characters in body
Aug
17
asked Best approximating linear polynomial for $|x|$ on $[-1,5]$
Aug
17
accepted best approximation polynomial $p_1(x)\in P_1$ for $x^3$
Aug
17
comment best approximation polynomial $p_1(x)\in P_1$ for $x^3$
@JimmyK4542 yes.
Aug
17
asked best approximation polynomial $p_1(x)\in P_1$ for $x^3$
Aug
3
asked How to make a good definiton
Jul
27
comment The difference between vector space and group
@BrianFitzpatrick That's what I need. I just wondering if I can define a basis in the $\mathbb{Z}$ module. For example let $x^2=x\cdot x$,$x^{-1}$ as the inverse element of $x$,$x^{-2}=x^{-1}\cdot x^{-1}$
Jul
27
accepted SOR method converges for $\left( \begin{array}{ccc}2& -1\\-2 & 2\end{array} \right)$
Jul
27
accepted Prove the matrix $\left( \begin{array}{ccc}A_{11}&A_{12}\\A_{21}&B_{22}+A_{21}A_{11}^{-1}A_{12}\end{array}\right)$ spd
Jul
27
accepted Euclidean space and Euclidean geometry
Jul
27
accepted Does every inner product space has an orthogonal basis?
Jul
27
asked The difference between vector space and group
Jul
23
comment Does every inner product space has an orthogonal basis?
But I think it is a basis
Jul
23
comment Does every inner product space has an orthogonal basis?
I can't see why it is not in the span?
Jul
23
comment Does every inner product space has an orthogonal basis?
@deftfyodor no,it is just for finite case