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Using the associativity relations of the topological Sigma Models with targetspaces, $CP^3, CP^4$ and $Gr(2,4)$ , we derive recursion relations of theircorrelation and evaluate them up to certain order in the expansion over theinstantons. The expansion coeffieients are regarded as the number of rationalcurves in $CP^3, CP^4$ and $Gr(2,4)$ which intersect various types ofsubmanifolds corresponding to the choice of BRST invariant operators in thecorrelation functions.Comment: 32pages, late

CALCULATION OF GROMOV-WITTEN INVARIANTS FOR CP3, CP4AND Gr(2, 4)

CALCULATION OF GROMOV-WITTEN INVARIANTS FOR CP³, CP⁴AND Gr(2, 4)