By introducing a matrix with non-numeric coefficients , one can actually let A live inside a matrix entry .
Then A I n ( \\ displaystyle AI_ ( n ) ) is not equal to A , and the conclusion is reached differently .
By introducing a matrix with non-numeric coefficients , one can actually let A live inside a matrix entry , but then A I n ( \\ displaystyle AI_ ( n ) ) is not equal to A , and the conclusion is reached differently .