### Iterated Ring Class Fields and the 168-Tesselation.

Harvey Cohn (1985)

Mathematische Annalen

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Harvey Cohn (1985)

Mathematische Annalen

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Czes Kosniowski (1973)

Mathematische Annalen

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Harvey Cohn (1983)

Mathematische Annalen

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P. Ribenboim (1964)

Mathematische Annalen

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A. Malcev (1937)

Mathematische Annalen

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J. VRABEC (1970)

Mathematische Annalen

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Tammo tom Dieck (1975)

Mathematische Annalen

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Mark Spivakovsky (1994)

Mathematische Annalen

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Putcha, Mohan S., Yaqub, Adil (1981)

Portugaliae mathematica

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N. R. Gopala Rao (1966)

Mathematische Annalen

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David Lines, Jorge Morales (1988)

Mathematische Annalen

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H.L. Resnikoff (1974)

Mathematische Annalen

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A. PERSSON (1965)

Mathematische Annalen

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M. Guyot (1985)

Mathematische Annalen

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Noboru Endou, Kazuhisa Nakasho, Yasunari Shidama (2015)

Formalized Mathematics

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In this article, semiring and semialgebra of sets are formalized so as to construct a measure of a given set in the next step. Although a semiring of sets has already been formalized in [13], that is, strictly speaking, a definition of a quasi semiring of sets suggested in the last few decades [15]. We adopt a classical definition of a semiring of sets here to avoid such a confusion. Ring of sets and algebra of sets have been formalized as non empty preboolean set [23] and field of subsets...