Identity matrix — Precalculus, what it means and where it is taught
The square matrix with ones down the diagonal; it leaves everything unchanged.
Taught in Precalculus.
Where it is taught
What it rests on
Work through these first if this one does not settle.
- Diagonal — A segment joining two non-adjacent vertices.
- Matrix — A rectangular array of numbers, described by its rows then columns.
Practise this idea
1 question in the course bank use Identity matrix, in Matrices & Systems.
Problem 1
What is the top-left entry of the 2 × 2 identity matrix?
Worked answer
1
[1001]