**Cayley**treated them in several papers (e.g.**Cayley**gave the formula E + 2D = eV + e'F, where e, E, V, F are the same as before, D is the same as Poinsot's k with the distinction that the area of a stellated face is reckoned as the sum of the triangles having their vertices at the centre of the face and standing on the sides, and e' is the ratio: " the angles subtended at the centre of a face by its sides /2rr."- Binet in France, Carl Gustav Jacobi in Germany, and James Joseph Sylvester and Arthur
**Cayley**in England. - The farreaching discoveries of Sylvester and
**Cayley**rank as one of the most important developments of pure mathematics. - Skew-determinants were studied by
**Cayley**; axisymmetric-determinants by Jacobi, V.

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