From 33abf26b306452078b7e07f684505a6ce32fa064 Mon Sep 17 00:00:00 2001 From: ben-jaynes <1btjaynes@gmail.com> Date: Tue, 6 Oct 2026 12:05:42 -0700 Subject: [PATCH] vault backup: 2026-10-06 12:05:42 --- .../Chapter 2.1 Notes.md | 17 ++++++++++++++--- College/AU 26/MATH 224 (Multivar)/Class 10-5.md | 2 +- 2 files changed, 15 insertions(+), 4 deletions(-) diff --git a/College/AU 26/MATH 208 (Matrix Algebra)/Chapter 2.1 Notes.md b/College/AU 26/MATH 208 (Matrix Algebra)/Chapter 2.1 Notes.md index d38e36d..d055c44 100644 --- a/College/AU 26/MATH 208 (Matrix Algebra)/Chapter 2.1 Notes.md +++ b/College/AU 26/MATH 208 (Matrix Algebra)/Chapter 2.1 Notes.md @@ -6,7 +6,7 @@ u_{1} \\ u_{2} \\ \vdots \\ u_{n} \end{bmatrix}$$ -> [!NOTE] Basic Properties +> [!INFO] Basic Properties > if $\mathbf{u}$ and $\mathbf{v}$ are vectors defined as > $$\mathbf{u} =\begin{bmatrix} > u_{1} \\ u_{2} \\ \vdots \\ u_{n} @@ -34,11 +34,22 @@ u_{1} \\ u_{2} \\ \vdots \\ u_{n} > c \cdot u_{1} \\ c \cdot u_{2} \\ \vdots \\ c \cdot u_{n} > \end{bmatrix}$$ + A linear combination of vectors is when vectors multiplied by scalar coefficients are added or subtracted $$c_{1}\mathbf{u_{1}}+c_{2}\mathbf{u_{2}}+\dots+c_{m}\mathbf{u_{m}}$$ is a linear combination if all $c$ values are scalars and $\mathbf{u}$ are vectors + The general form of a solution to a linear system of equations can be represented as a linear combination of vectors -if the solution of a linear system of equations is -$$$$ \ No newline at end of file +> [!EXAMPLE] Example +> if the solution of a linear system of equations is +> $$\begin{gather} x_{1} = 2 - 11s_{1} \\ x_{2} = 2 - 4s_{1} \\ x_{3} = 0 + 1s_{1} \end{gather}$$ then the vector form of the general solution is +> $$\mathbf{x} = \begin{bmatrix} +> x_{1} \\ x_{2} \\ x_{3} +> \end{bmatrix} = \begin{bmatrix} +> 2 \\ 2 \\ 0 +> \end{bmatrix} + s_{1}\begin{bmatrix} +> -11 \\ -4 \\ 1 +> \end{bmatrix}$$ + diff --git a/College/AU 26/MATH 224 (Multivar)/Class 10-5.md b/College/AU 26/MATH 224 (Multivar)/Class 10-5.md index 70db885..6c74a8c 100644 --- a/College/AU 26/MATH 224 (Multivar)/Class 10-5.md +++ b/College/AU 26/MATH 224 (Multivar)/Class 10-5.md @@ -25,7 +25,7 @@ $$\int_{a}^b \int_{g_{1}(x)}^{g_{2}(x)} f(x,y) \ dydx$$ This can also be done if $D$ is bound by functions on the x-axis instead of the y-axis -> [!note] Property +> [!info] Property > If $D=D_{1} \cup D_{2}$ and $D_{1}$ and $D_{2}$ do not intersect except at their boundaries then > $$\int \int_{D} f(x,y) \ dA = \int \int_{D_{1}} f(x,y) \ dA + \int \int_{D_{2}} f(x,y) \ dA$$ > This can be used to split up integrals similar to area in 2D