rank of a unit identity matrix of order 4 is
Identity matrix The identity matrix of a given size is the only idempotent matrix of that size having full rank. That is, it is the only matrix such that (a) when multiplied by itself the result is itself, and (b) all of its rows, and all of its columns, are linearly independent.
The Four: Battle for Stardom The Four: Battle for Stardom, also known as The Four, is an American reality television music competition show created by Armoza Formats and produced by ITV Entertainment and Armoza Formats.[2] The show, based on an Israeli format called The Final Four,[3] premiered on Fox on January 4, 2018.[4] The winner is awarded a recording contract with Republic Records, a division of Universal Music Group, and is named iHeartRadio's "On the Verge" artist.[5] The first season winner was Evvie McKinney.[1]