John Hewson (regicide) John Hewson (regicide) Colonel John Hewson (Hughson) (died 1662) was a soldier in the New Model Army and signed the death warrant of King Charles I, making him a regicide. Before the English Civil War Hewson was a cobbler and then a shoemaker. When John Lilburne was his apprentice in the 1630s, he introduced Lilburne to the Puritan physician John Bastwick, an active pamphleteer who was persecuted by Archbishop William Laud. He was second in command of John Pickering's Regiment of Foot, one of the original twelve foot regiments of the New Model Army. When John Pickering died on 24
Conformal Killing equation Conformal Killing equation In conformal geometry, the conformal Killing equation on a manifold of space-dimension "n" with metric formula_1 describes those vector fields formula_2 which preserve formula_1 up to scale, i.e. for some function formula_5 (where formula_6 is the Lie derivative). Vector fields that satisfy the conformal Killing equation are exactly those vector fields whose flow preserves the conformal structure of the manifold. The name Killing refers to Wilhelm Killing, who first investigated the Killing equation for vector fields that preserve a Riemannian metric. By taking the trace we find that necessarily formula_7. Therefore we can write the conformal Killing