Geodesic
An old letter from J.~Tate to B.~Dwork, as~viewed recently by J.~Tate and B.~Mazur
Izvestiya. Mathematics , Tome 80 (2016) no. 5, pp. 954-957.

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In this paper, the constant $C$, which is defined in the letter for a fixed ordinary elliptic curve, is viewed as a special value of formal function on a vast ind-profinite “Galois cover of the ‘Hasse Domain’ ” $H$ parametrizing all ordinary elliptic curves, viewed as a formal scheme.
Keywords: discrete valuation ring, elliptic curve, cover.
Mots-clés : Hasse invariant, Frobenius endomorphism 
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J. Tate. An old letter from J.~Tate to B.~Dwork, as~viewed recently by J.~Tate and B.~Mazur. Izvestiya. Mathematics , Tome 80 (2016) no. 5, pp. 954-957. http://geodesic.mathdoc.fr/item/IM2_2016_80_5_a6/

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