  The usefulness of Riemann P-symbols in deriving identities involving the
parametrized special function Hl is explored. Hl is the analytic local solution
of the Heun equation, the canonical second-order differential equation on the
Riemann sphere with four regular singular points. The identities discussed
include ones coming from Moebius automorphisms and F-homotopies, and also
quadratic and biquadratic transformations. The case when Hl is identical to a
generalized hypergeometric function of 3F2 type is examined, and Pfaff and
Euler transformations of 3F2(a1,a2,e+1;b1,e;x) are derived. They extend several
3F2 identities of Bailey and Slater.
