| 41. | Georg Cantor developed the fundamental concepts of infinite set theory.
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| 42. | The resulting argument uses only five axioms of set theory.
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| 43. | The axiom of separation is included in intuitionistic set theory.
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| 44. | This proved Frege's naive set theory led to a contradiction.
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| 45. | Zermelo set theory was the first axiomatic set theory.
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| 46. | Within the framework of Zermelo Fraenkel set theory classes.
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| 47. | This relationship is important in effective descriptive set theory.
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| 48. | This is in accordance with models of set theory.
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| 49. | Zermelo set theory was the first axiomatic set theory.
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| 50. | He was particularly drawn to Georg Cantor's set theory.
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