On Orbits of SL(2,Z)+ and Values of Bina
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S.G. Dani; Arnaldo Nogueira
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Article
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2002
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Elsevier Science
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English
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We consider actions of SLรฐ2; Zร and SLรฐ2; Zร รพ (semigroup of matrices with nonnegative integral entries) on the projective space P and on P ร P. Results are obtained on orbit-closures under these actions and they are applied to describe a class of binary quadratic forms Q such that the sets QรฐZ 2 ร