Question

Why is the coordinate vector of a linear combination equal to a linear combination of coordinate vectors?

score 569 · Answer 1 · 2026-04-12 15:13:47

569

Views

Why is the coordinate vector of a linear combination equal to a linear combination of coordinate vectors?

Published on 12 Apr 2026 - 15:13

score 72 · Answer 2 · 2026-04-14 17:03:03

72

Views

Calculate user satisfaction with the formula $\bar{x} = \frac{\sum^n_{i=1} w_ix_i}{\sum^n_{i=1} x_i}$

Published on 14 Apr 2026 - 17:03

score 753 · Answer 3 · 2026-04-29 12:43:02

753

Views

Prove that grounded Laplacian/reduced conductance matrix is non-singular

Published on 29 Apr 2026 - 12:43

score 70 · Answer 4 · 2026-04-14 00:23:37

70

Views

the normal to the plane $x = z$

Published on 14 Apr 2026 - 0:23

score 60 · Answer 5 · 2026-04-08 23:49:39

60

Views

Proof check in Linear Algebra with Diagonalizable operator

Published on 08 Apr 2026 - 23:49

score 64 · Answer 6 · 2026-04-15 03:04:23

64

Views

$\rho(A)^{-1}D^{-1}AD$ a stochastic matrix with $A > 0 \in M_n$?

Published on 15 Apr 2026 - 3:04

score 164 · Answer 7 · 2026-03-25 03:02:04

164

Views

Let $f$ be a real polynomial function find relation between the coefficients such that its roots are in an progression

Published on 25 Mar 2026 - 3:02

score 91 · Answer 8 · 2026-04-12 09:57:02

91

Views

What is so special about $\underline{i}-2\underline{j}+\underline{k}$?

Published on 12 Apr 2026 - 9:57

score 78 · Answer 9 · 2026-04-14 09:09:47

78

Views

3D rotation minimizing the distance between 2D points and 3D projected points: closed-form formula?

Published on 14 Apr 2026 - 9:09

score 1.7k · Answer 10 · 2026-04-16 01:21:58

1.7k

Views

find the matrix for the reflection over a line that goes through the origin and makes the angle pi/17 with the x-axis.

Published on 16 Apr 2026 - 1:21

score 113 · Answer 11 · 2026-04-14 07:23:47

113

Views

Determine an equation of the line $g$ in coordinates $x', y'$ in terms of the basis $B$

Published on 14 Apr 2026 - 7:23

score 320 · Answer 12 · 2026-04-12 06:00:35

320

Views

System of equations, linear. Unique solution, infinite number of solutions, no solution?

Published on 12 Apr 2026 - 6:00

score 223 · Answer 13 · 2026-04-17 01:06:10

223

Views

Let $X$ be Banach space and $X^*$ be its dual space. Let $S\subset X$ be a convex set containing the origin. Prove that $\bar S = S^{**}.$

Published on 17 Apr 2026 - 1:06

score 349 · Answer 14 · 2026-04-11 11:51:02

349

Views

If an operator in $X$ with compact resolvent is bounded, $X$ must be finite dimensional.

Published on 11 Apr 2026 - 11:51

score 5.1k · Answer 15 · 2026-04-17 06:50:58

If $\mathrm A = \{ (x,y): x^2 + y^2 = 25\}$ and $\mathrm B = \{ (x,y): x^2 + 9y^2 = 144 \}$, Find $ n( \text A \; \cap \; \text B)$

List Question

Why is the coordinate vector of a linear combination equal to a linear combination of coordinate vectors?

Calculate user satisfaction with the formula $\bar{x} = \frac{\sum^n_{i=1} w_ix_i}{\sum^n_{i=1} x_i}$

Prove that grounded Laplacian/reduced conductance matrix is non-singular

the normal to the plane $x = z$

Proof check in Linear Algebra with Diagonalizable operator

$\rho(A)^{-1}D^{-1}AD$ a stochastic matrix with $A > 0 \in M_n$?

Let $f$ be a real polynomial function find relation between the coefficients such that its roots are in an progression

What is so special about $\underline{i}-2\underline{j}+\underline{k}$?

3D rotation minimizing the distance between 2D points and 3D projected points: closed-form formula?

find the matrix for the reflection over a line that goes through the origin and makes the angle pi/17 with the x-axis.

Determine an equation of the line $g$ in coordinates $x', y'$ in terms of the basis $B$

System of equations, linear. Unique solution, infinite number of solutions, no solution?

Let $X$ be Banach space and $X^*$ be its dual space. Let $S\subset X$ be a convex set containing the origin. Prove that $\bar S = S^{**}.$

If an operator in $X$ with compact resolvent is bounded, $X$ must be finite dimensional.

If $\mathrm A = \{ (x,y): x^2 + y^2 = 25\}$ and $\mathrm B = \{ (x,y): x^2 + 9y^2 = 144 \}$, Find $ n( \text A \; \cap \; \text B)$

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