The Deformation Theory of the Instine Field Equations

When you take the composition of the two, the differential operators fall out. You're left with an obstruction term that looks like the instinfield quite well. And if you can get that sequence to terminate by looking at something like a half signature theorem or a bent back dram complex, in the case of dimension three, you have an at a singer theory. So this is computing the dieriski tangent space just as if you were doing self dual theory, or turn simon's theory.