$
(\DeclareMathOperator{\End}{End}
\DeclareMathOperator{\Ker}{Ker}
\DeclareMathOperator{\Imm}{Im}
\DeclareMathOperator{\Hom}{Hom}
\DeclareMathOperator{\op}{op}
\DeclareMathOperator{\Mat}{Mat}
\DeclareMathOperator{\Irr}{Irr}
\DeclareMathOperator{\Id}{Id}
$