A passage in James Blish's Black Easter and The Day After Judgment (London, 1972), pp. 173-17, is relevant to the discussion in the previous post. To paraphrase -
Baines: The conservation laws apply to matter and energy but demons are neither.
Satvje: They may be unified fields of electro-magnetico-gravitic energy with 100 per cent negative entropy.
Buelg: Completely negative entropy is impossible but stable negative entropy would be H(x)-Hy(x)=C+E.
Satvje: That would be eternal life.
Buelg: Eternal barring accidents. We ought to be able to disrupt the electromagnetic part of the system and thus to kill spirits.
However, I do not understand the equation.
