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An identity Ramanujan probably missed

Susil Kumar Jena (2015)

Colloquium Mathematicae

"Ramanujan's 6-10-8 identity" inspired Hirschhorn to formulate his "3-7-5 identity". Now, we give a new "6-14-10 identity" which we suppose Ramanujan would have discovered but missed to mention in his notebooks.

Congruent numbers with higher exponents

Florian Luca, László Szalay (2006)

Acta Mathematica Universitatis Ostraviensis

This paper investigates the system of equations x 2 + a y m = z 1 2 , x 2 - a y m = z 2 2 in positive integers x , y , z 1 , z 2 , where a and m are positive integers with m 3 . In case of m = 2 we would obtain the classical problem of congruent numbers. We provide a procedure to solve the simultaneous equations above for a class of the coefficient a with the condition gcd ( x , z 1 ) = gcd ( x , z 2 ) = gcd ( z 1 , z 2 ) = 1 . Further, under same condition, we even prove a finiteness theorem for arbitrary nonzero a .

Contre-exemples au principe de Hasse pour les courbes de Fermat

Alain Kraus (2016)

Acta Arithmetica

Let p be an odd prime number. In this paper, we are concerned with the behaviour of Fermat curves defined over ℚ, given by equations a x p + b y p + c z p = 0 , with respect to the local-global Hasse principle. It is conjectured that there exist infinitely many Fermat curves of exponent p which are counterexamples to the Hasse principle. This is a consequence of the abc-conjecture if p ≥ 5. Using a cyclotomic approach due to H. Cohen and Chebotarev’s density theorem, we obtain a partial result towards this conjecture, by...

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