Superconformal simple type and Witten's conjecture

Let $X$ be a smooth, closed, connected, orientable four-manifold with $b^1(X)=0$ and $b^{+}(X)\ge 3$ and odd. We show that if $X$ has Seiberg-Witten simple type, then the SO(3)-monopole cobordism formula of Feehan and Leness (2002) implies Witten’s Conjecture relating the Donaldson and Seiberg-Witten invariants.