Texas Instruments TI-83 PLUS - Manual (Page 275)

TI-83 Plus Matrices 272
matrix L 1
Powers
To raise a matrix to a power, matrix must be square. You can use 2 ( ¡ ),
3 (
MATH
menu), or ^ power ( › ) for integer power between 0 and 255 .
matrix 2
matrix 3
matrix ^ power
Relational Operations
To compare two matrices using the relational operations = and ƒ (
TEST
menu), they must have the same dimensions. = and ƒ compare matrixA
and matrixB on an element-by-element basis. The other relational
operations are not valid with matrices.
matrixA = matrixB returns 1 if every comparison is true; it returns 0 if any
comparison is false.