Linear Algebra Examples

$[\begin{array}{c} 1 & 0 & 0 & 0 \\ 0 & 1 & 1 & 0 \\ 0 & 1 & 1 & 0 \\ 0 & 0 & 0 & 1 \end{array}] \cdot 1$

Step 1

Move $1$ to the left of $[\begin{array}{c} 1 & 0 & 0 & 0 \\ 0 & 1 & 1 & 0 \\ 0 & 1 & 1 & 0 \\ 0 & 0 & 0 & 1 \end{array}]$ .

$1 \cdot [\begin{array}{c} 1 & 0 & 0 & 0 \\ 0 & 1 & 1 & 0 \\ 0 & 1 & 1 & 0 \\ 0 & 0 & 0 & 1 \end{array}]$

Step 2

Multiply $1$ by each element of the matrix.

$[\begin{array}{c} 1 \cdot 1 & 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 1 & 1 \cdot 1 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 1 & 1 \cdot 1 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 1 \end{array}]$

Step 3

Simplify each element in the matrix.

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Step 3.1

Multiply $1$ by $1$ .

$[\begin{array}{c} 1 & 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 1 & 1 \cdot 1 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 1 & 1 \cdot 1 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 1 \end{array}]$

Step 3.2

Multiply $0$ by $1$ .

$[\begin{array}{c} 1 & 0 & 1 \cdot 0 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 1 & 1 \cdot 1 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 1 & 1 \cdot 1 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 1 \end{array}]$

Step 3.3

Multiply $0$ by $1$ .

$[\begin{array}{c} 1 & 0 & 0 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 1 & 1 \cdot 1 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 1 & 1 \cdot 1 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 1 \end{array}]$

Step 3.4

Multiply $0$ by $1$ .

$[\begin{array}{c} 1 & 0 & 0 & 0 \\ 1 \cdot 0 & 1 \cdot 1 & 1 \cdot 1 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 1 & 1 \cdot 1 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 1 \end{array}]$

Step 3.5

Multiply $0$ by $1$ .

$[\begin{array}{c} 1 & 0 & 0 & 0 \\ 0 & 1 \cdot 1 & 1 \cdot 1 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 1 & 1 \cdot 1 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 1 \end{array}]$

Step 3.6

Multiply $1$ by $1$ .

$[\begin{array}{c} 1 & 0 & 0 & 0 \\ 0 & 1 & 1 \cdot 1 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 1 & 1 \cdot 1 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 1 \end{array}]$

Step 3.7

Multiply $1$ by $1$ .

$[\begin{array}{c} 1 & 0 & 0 & 0 \\ 0 & 1 & 1 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 1 & 1 \cdot 1 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 1 \end{array}]$

Step 3.8

Multiply $0$ by $1$ .

$[\begin{array}{c} 1 & 0 & 0 & 0 \\ 0 & 1 & 1 & 0 \\ 1 \cdot 0 & 1 \cdot 1 & 1 \cdot 1 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 1 \end{array}]$

Step 3.9

Multiply $0$ by $1$ .

$[\begin{array}{c} 1 & 0 & 0 & 0 \\ 0 & 1 & 1 & 0 \\ 0 & 1 \cdot 1 & 1 \cdot 1 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 1 \end{array}]$

Step 3.10

Multiply $1$ by $1$ .

$[\begin{array}{c} 1 & 0 & 0 & 0 \\ 0 & 1 & 1 & 0 \\ 0 & 1 & 1 \cdot 1 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 1 \end{array}]$

Step 3.11

Multiply $1$ by $1$ .

$[\begin{array}{c} 1 & 0 & 0 & 0 \\ 0 & 1 & 1 & 0 \\ 0 & 1 & 1 & 1 \cdot 0 \\ 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 1 \end{array}]$

Step 3.12

Multiply $0$ by $1$ .

$[\begin{array}{c} 1 & 0 & 0 & 0 \\ 0 & 1 & 1 & 0 \\ 0 & 1 & 1 & 0 \\ 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 1 \end{array}]$

Step 3.13

Multiply $0$ by $1$ .

$[\begin{array}{c} 1 & 0 & 0 & 0 \\ 0 & 1 & 1 & 0 \\ 0 & 1 & 1 & 0 \\ 0 & 1 \cdot 0 & 1 \cdot 0 & 1 \cdot 1 \end{array}]$

Step 3.14

Multiply $0$ by $1$ .

$[\begin{array}{c} 1 & 0 & 0 & 0 \\ 0 & 1 & 1 & 0 \\ 0 & 1 & 1 & 0 \\ 0 & 0 & 1 \cdot 0 & 1 \cdot 1 \end{array}]$

Step 3.15

Multiply $0$ by $1$ .

$[\begin{array}{c} 1 & 0 & 0 & 0 \\ 0 & 1 & 1 & 0 \\ 0 & 1 & 1 & 0 \\ 0 & 0 & 0 & 1 \cdot 1 \end{array}]$

Step 3.16

Multiply $1$ by $1$ .

$[\begin{array}{c} 1 & 0 & 0 & 0 \\ 0 & 1 & 1 & 0 \\ 0 & 1 & 1 & 0 \\ 0 & 0 & 0 & 1 \end{array}]$