TY - JOUR T1 - A Memoir on the Conditions for the Existence of Given Systems of Equalities among the Roots of an Equation JF - Philosophical Transactions of the Royal Society of London (1776-1886) VL - 147 SP - 727 EP - 731 PY - 1857/01/01/ UR - http://dx.doi.org/10.1098/rstl.1857.0034 M3 - doi:10.1098/rstl.1857.0034 AU - Cayley, A. ER -