Hercule Poirot British government, including foiling the attempted abduction of the Prime Minister. Readers were told that the British authorities had learned of Poirot's keen investigative ability from certain members of Belgium's royal family. After the war Poirot became a private detective and began undertaking civilian cases. He moved into what became both his home and work address, Flat 203 at 56B Whitehaven Mansions. Hastings first visits the flat when he returns to England in June 1935 from Argentina in "The A.B.C. Murders", Chapter 1. The TV programmes place this in Florin Court, Charterhouse Square, in the wrong part of London. According
SQ-universal group SQ-universal group In mathematics, in the realm of group theory, a countable group is said to be SQ-universal if every countable group can be embedded in one of its quotient groups. SQ-universality can be thought of as a measure of largeness or complexity of a group. Many classic results of combinatorial group theory, going back to 1949, are now interpreted as saying that a particular group or class of groups is (are) SQ-universal. However the first explicit use of the term seems to be in an address given by Peter Neumann to The London Algebra Colloquium entitled "SQ-universal groups" on