| 11. | "' Inversive activities "'are processes which self internalise the action concerned.
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| 12. | Every " E "-inversive semigroup is regular, but not vice versa.
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| 13. | For example, a person who has an Inversive personality internalises his emotions from any exterior source.
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| 14. | In 1926 he wrote a dissertation " Differential Invariants of Inversive Geometry " for his doctoral degree.
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| 15. | For graduate study, Boyd went to Johns Hopkins University where he studied inversive geometry with Frank Morley.
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| 16. | Continuing to collaborate with Morley, they co-wrote a paper on algebraic inversive invariants in 1930.
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| 17. | The concept of " E "-inversive semigroup was introduced by Gabriel Thierrin in 1955.
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| 18. | Semigroups in this class have also been called "'0-inversive semigroups . "'
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| 19. | Another example concerns inversive geometry as advanced by Ludwig Immanuel Magnus, which can be considered synthetic in spirit.
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| 20. | Thus inversive geometry, a larger study than grade school transformation geometry, is usually reserved for college students.
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