A differential arithmetic is proposed for simplifying the observational equation as well as for avoiding the computation of the unknown integer constant.
提出相邻历元间差分算法，大大简化了观测方程，同时避免积分常量的计算。
Over 1200 videos lessons covering everything from basic arithmetic and algebra to differential equations, physics, chemistry, biology and finance.
可汉学院（Khan Academy） - 超过1200个视频教程，内容涵盖自基础算术、代数至微分方程、物理学、化学、生物学和金融学。
My friend and I did some arithmetic, some algebra, derived the general formula for the differential at a point-all stuff he had had in the course.
我和我的朋友做了些算术和代数，得到了某一点的微分公式——这些都是他上课学过的。
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