A research on idempotent matrix

This is a summary of research within the real number on idempotent matrix.Giver a definition of idempotent matrices,meanwhile the author lists and proves the nature of idempotent matrix.As for part of the features of idempotent matrix there is a study in-depth.When it comes to the conclusion of idempotent matrix there is a careful study from various angles with appropriate examples in the right places,which makes Abstract content become easier to understand.