Write the Word or Phrase That Best Completes Each Statement $A ^ { - 1 }$

Short Answer

Write the word or phrase that best completes each statement or answers the question.
Provide the missing information.
-Given an n × n matrix A, if there exists a matrix $A ^ { - 1 }$ such that $A \cdot A ^ { - 1 } = I _ { n } \text { and } A ^ { - 1 } \cdot A = I _ { n } \text {, then } A ^ { - 1 } \text { is }$ called the ________of A.