N or M? [SEP] publisher
N or M?
N or M? is a work of detective fiction by Agatha Christie first published in the US by Dodd, Mead and Company in 1941 and in the UK by the Collins Crime Club in November of the same year. The US edition retailed $2.00 and the UK edition at seven shillings and sixpence (7/6).
The title is taken from a catechism in the Book of Common Prayer which asks, "What is your Christian name? Answer N. or M." The "N. or M.
number of tangential surface BMOs. If m polyhedra condense to form a macropolyhedron, m core BMOs will be formed. Thus the SEP requirement of closo-condensed polyhedral clusters is m+n. Single-vertex sharing is a special case, where each sub-cluster needs to satisfy Wade’s rule separately. Let a and b be the number of vertices in the sub-clusters including the shared atom. The first cage requires a+1 and second cage requires b+1 skeletal electron pairs (SEPs). Thus a total of a+b+2 or a+b+m