In mathematics, in the areas of order theory and combinatorics, Mirsky's theorem characterizes the height of any finite partially ordered set in terms of a partition of the order into a minimum number of antichains.
 It is named for and is closely related to Dilworth's theorem on the widths of partial orders, to the perfection of comparability graphs, to the Gallai–Hasse–Roy–Vitaver theorem relating longest paths and colorings in graphs, and to the Erdős–Szekeres theorem on monotonic subsequences.
Blues Section are a Finnish rock music group.
 They started in 1967, formed around the vocalist Jim Pembroke, a British expatriate song-writer now living in Finland.
 The other members of the band were Eero Koivistoinen (saxophone), Ronnie Österberg (drums), Hasse Walli (guitar), and Måns Groundstroem (bass).
 Their influences came above all from John Mayall's Bluesbreakers and Jimi Hendrix, who had played a gig in Helsinki in May 1967.
 One can also hear in Pembroke's British-flavoured song-writing some echoes from The Beatles and The Kinks.
 Blues Section released a self-titled album late 1967 on Helsinki's Love Records.
 In 1968 Groundstroem and Pembroke left the band, being replaced by Pekka Sarmanto and (another British vocalist) Frank Robson, respectively.
 Also Koivistoinen would leave the band during the same year, and by the end of 1968 Blues Section was over.
 The Blues Section members would continue in such acclaimed progressive rock bands as Wigwam and Tasavallan Presidentti.
 Eero Koivistoinen was to become an internationally acclaimed jazz musician, and Hasse Walli would discover world music, playing in such bands as Piirpauke.
The Hasse–Davenport relations, introduced by , are two related identities for Gauss sums, one called the Hasse–Davenport lifting relation, and the other called the Hasse–Davenport product relation.
 The Hasse–Davenport lifting relation is an equality in number theory relating Gauss sums over different fields.
 used it to calculate the zeta function of a Fermat hypersurface over a finite field, which motivated the Weil conjectures.
Mrs. Warren's Profession (German: Frau Warrens Gewerbe) is a 1960 West German drama film directed by Ákos Ráthonyi and starring Lilli Palmer, O. E. Hasse and Johanna Matz.
 It is an adaptation of George Bernard Shaw's 1894 play "Mrs. Warren's Profession".
The Hasse–Minkowski theorem is a fundamental result in number theory which states that two quadratic forms over a number field are equivalent if and only if they are equivalent "locally at all places", i.e. equivalent over every completion of the field (which may be real, complex, or p-adic).
 A related result is that a quadratic space over a number field is isotropic if and only if it is isotropic locally everywhere, or equivalently, that a quadratic form over a number field nontrivially represents zero if and only if this holds for all completions of the field.
 The theorem was proved in the case of the field of rational numbers by Hermann Minkowski and generalized to number fields by Helmut Hasse.
 The same statement holds even more generally for all global fields.
Curtis Francis Warren (born 31 May 1963) is an English gangster, who as Britain's most notorious drugs trafficker was formerly Interpol's Target One, and once listed on the Sunday Times Rich List.
Curtis Warren Pitt (born 1 February 1977) is an Australian politician who has been an Australian Labor Party member of the Legislative Assembly of Queensland since 2009, representing the district of Mulgrave.
 On 14 February 2015, he was sworn in as Treasurer of Queensland.
Paul Grimes (born 26 May 1950) is a former gangster who, from an early age, was active in Liverpool's criminal underworld.
 He has 38 criminal convictions and was involved in a range of violent and illegal activities.
 He also set up legal businesses recycling scrap metal and disposing of waste.
 He was rich, successful and at the top of the gangster hierarchy when his son Jason died of a heroin overdose in 1992, at the age of 21.
 This tragedy led to Grimes becoming a police informer with the aim of bringing down the drug dealers who he felt had destroyed his son's life.
 His evidence has led to successful prosecutions against high-profile dealers such as John Haase and Curtis Warren.
 The information Grimes provided also led to his son Heath being jailed for five years.
Curtis Warren Kamman (born January 15, 1939, in Chicago, Illinois) is a former career diplomat.
John Haase (born 1948) is an English gangster, drug dealer and associate of Curtis Warren.

Question: How is Curtis Warren related to John Hasse? 
Answer: associate of