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- W1563377168 abstract "We consider $N$, the number of solutions $(x,y,u,v)$ to the equation $ (-1)^u r a^x + (-1)^v s b^y = c $ in nonnegative integers $x, y$ and integers $u, v in {0,1}$, for given integers $a>1$, $b>1$, $c>0$, $r>0$ and $s>0$. Previous work showed that there are nine essentially distinct $(a,b,c,r,s)$ for which $N ge 4$, except possibly for cases in which the solutions have $r$, $a$, $x$, $s$, $b$, and $y$ each bounded by $8 cdot 10^{14}$ or $2 cdot 10^{15}$. In this paper we show that there are no further cases with $N ge 4$ within these bounds. We note that $N = 3$ for an infinite number of $(a,b,c,r,s)$, even if we eliminate from consideration cases which are directly derived from other cases in one of several completely designated ways. Our work differs from previous work in that we allow $x$ and $y$ to be zero and also allow choices of $(u,v)$ other than $(0,1)$." @default.
- W1563377168 created "2016-06-24" @default.
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- W1563377168 date "2011-12-20" @default.
- W1563377168 modified "2023-09-27" @default.
- W1563377168 title "Handling a large bound for a problem on the generalized Pillai equation $pm r a^x pm s b^y = c$" @default.
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