mathematically

some people are very mathematically inclined.

有些非常有数学才能。

In order to define this irrotationality condition mathematically, let us consider the equation of motion in terms of velocities.

为了从数学上确定此无旋条件，我们考虑以速度为未知函数的运动方程。

CONCLUSIONS: When all other identified risk factors were controlled for mathematically, metastasectomy maintained a significant surial adantage for patients with pulmonary metastatic melanoma.

结论：当其他的鉴别风险因子术的控制后，转瘤切除术对有肺转色素瘤患者仍有显著的生存优势。