Abstract
Duality arguments are used to determine D-instanton contributions to certain effective interaction terms of type II supergravity theories in various dimensions. This leads to exact expressions for the partition functions of the finite N D-instanton matrix model in $d=4$ and 6 dimensions that generalize our previous expression for the case $d=10.$ These results are consistent with the fact that the Witten index of the T-dual D-particle process should only be nonvanishing for $d=10.$
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