  A strategy for proving (not a proof of, as was the first over-optimistic
belief) the Riemann hypothesis is suggested. The vanishing of Riemann Zeta
reduces to an orthogonality condition for the eigenfunctions of a non-Hermitian
operator D^+ having the zeros of Riemann Zeta as its eigenvalues. The
construction of D^+ is inspired by the conviction that Riemann Zeta is
associated with a physical system allowing superconformal transformations as
its symmetries and second quantization in terms of the representations of
superconformal algebra. The eigenfunctions of D^+ are analogous to the so
called coherent states and in general not orthogonal to each other. The states
orthogonal to a vacuum state (having a negative norm squared) correspond to the
zeros of Riemann Zeta. The physical states having a positive norm squared
correspond to the zeros of Riemann Zeta at the critical line. Riemann
hypothesis follows by reductio ad absurdum from the hypothesis that ordinary
superconformal algebra acts as gauge symmetries for all coherent states
orthogonal to the vacuum state, including also the non-physical coherent states
that might exist off from the critical line.
