Property
Involutory matrices
- the identity matrix
A matrix whose square is the identity is its own inverse, and its even powers are the identity.
16
questions use it
7
of them past-year
2017–2026
years it has appeared
6%
rated HARD
3
exams
Used alongside
How often each of these appears in the same solution as this one.
16 questions whose solution uses this
Every one was read individually — a question is here because its solution invokes this, not because the stem mentions it.
Every identity this chapter tests, with its own question set.
All Matrices & Determinants formulas