mathjs A+A 21 microseconds mathjs A*A 288 microseconds mathjs A' 23 microseconds mathjs det(A) 10349 microseconds sylvester A+A 20 microseconds sylvester A*A 184 microseconds sylvester A' 11 microseconds sylvester det(A) 103 microseconds numericjs A+A 6 microseconds numericjs A*A 30 microseconds numericjs A' 3 microseconds numericjs det(A) 15 microseconds ndarray A+A 6 microseconds ndarray A*A 42 microseconds ndarray A' 4 microseconds ndarray det(A) 10 microseconds