%0 Journal Article %T The tangent space at a special symplectic instanton bundle on P^{2n+1} %A Carla Dionisi %J Mathematics %D 1997 %I arXiv %X Let $MI_{Simp,P^{2n+1}}(k)$ be the moduli space of stable symplectic instanton bundles on $P^{2n+1}$ with second Chern class $c_2=k$ (it is a closed subscheme of the moduli space $MI_{P^{2n+1}}(k)$), We prove that the dimension of its Zariski tangent space at a special (symplectic) instanton bundle is $2k(5n-1)+4n^2-10n+3, k\geq 2$. It follows that special symplectic instanton bundles are smooth points for $ k \leq 3 $ %U http://arxiv.org/abs/alg-geom/9707011v1