Abstract
An explicit upper bound B(n) is derived for the number of zeros of Abelian integrals I(h)=∮Γhg(x,y)dx-f(x,y)dy on the open interval (0,1/4), where Γh is an oval lying on the algebraic curve H(x,y)=x2+y2-x4+ax2y2+y4 with a>-2,f(x,y) and g(x,y) are polynomials in x and y of degrees not exceeding n. Assume I(h) not vanish identically, then B(n)≤3n-14+12n-34+23.
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