Displaying 161 – 180 of 330

Showing per page

On the diophantine equation f(x)f(y) = f(z)²

Maciej Ulas (2007)

Colloquium Mathematicae

Let f ∈ ℚ [X] and deg f ≤ 3. We prove that if deg f = 2, then the diophantine equation f(x)f(y) = f(z)² has infinitely many nontrivial solutions in ℚ (t). In the case when deg f = 3 and f(X) = X(X²+aX+b) we show that for all but finitely many a,b ∈ ℤ satisfying ab ≠ 0 and additionally, if p|a, then p²∤b, the equation f(x)f(y) = f(z)² has infinitely many nontrivial solutions in rationals.

On the diophantine equation x 2 + 5 k 17 l = y n

István Pink, Zsolt Rábai (2011)

Communications in Mathematics

Consider the equation in the title in unknown integers ( x , y , k , l , n ) with x 1 , y > 1 , n 3 , k 0 , l 0 and gcd ( x , y ) = 1 . Under the above conditions we give all solutions of the title equation (see Theorem 1).

On the diophantine equation x y - y x = c z

Zhongfeng Zhang, Jiagui Luo, Pingzhi Yuan (2012)

Colloquium Mathematicae

Applying results on linear forms in p-adic logarithms, we prove that if (x,y,z) is a positive integer solution to the equation x y - y x = c z with gcd(x,y) = 1 then (x,y,z) = (2,1,k), (3,2,k), k ≥ 1 if c = 1, and either ( x , y , z ) = ( c k + 1 , 1 , k ) , k ≥ 1 or 2 x < y m a x 1 . 5 × 10 10 , c if c ≥ 2.

On the equation a p + 2 α b p + c p = 0

Kenneth A. Ribet (1997)

Acta Arithmetica

We discuss the equation a p + 2 α b p + c p = 0 in which a, b, and c are non-zero relatively prime integers, p is an odd prime number, and α is a positive integer. The technique used to prove Fermat’s Last Theorem shows that the equation has no solutions with α < 1 or b even. When α=1 and b is odd, there are the two trivial solutions (±1, ∓ 1, ±1). In 1952, Dénes conjectured that these are the only ones. Using methods of Darmon, we prove this conjecture for p≡ 1 mod 4.

Currently displaying 161 – 180 of 330