isIdentity       1461 modules/core/src/matop.cpp     bool i1 = isIdentity(e1), i2 = isIdentity(e2);
isIdentity       1478 modules/core/src/matop.cpp     bool i1 = isIdentity(e1), i2 = isIdentity(e2);
isIdentity       1528 modules/core/src/matop.cpp     if( isInv(e1) && isIdentity(e2) )