例如，對於立方體，有6 − 12 + 8 = 2，而對於四面體，有4 − 6 + 4 = 2.。呢條公式亦都叫做歐拉公式。呢條式最早由法國數學家笛卡兒喺1635年左右證明，但係無人知。後嚟瑞士數學家歐拉喺17500年獨立證明咗呢條公式。1860年，笛卡兒嘅證明被人發現咗，之後呢條式就被人叫做歐拉-笛卡兒公式。
For example, for a cube, there is 6 −12 + 8 = 2, and for a tetrahedron, there is 4−6 + 4 = 2. This formula is also called Euler's formula. This formula was first proved by the France mathematician Descartes around 1635, but no one knows about it. Later, the Switzerland mathematician Euler independently proved this formula in 17500. In 1860, the proof of Descartes was discovered, and the formula became known as the Euler-Cartesian formula.