  We find the complete equivalence group of a class of (1+1)-dimensional
second-order evolution equations, which is infinite-dimensional. The
equivariant moving frame methodology is invoked to construct, in the regular
case of the normalization procedure, a moving frame for a group related to the
equivalence group in the context of equivalence transformations among equations
of the class under consideration. Using the moving frame constructed, we
describe the algebra of differential invariants of the former group by
obtaining a minimum generating set of differential invariants and a complete
set of independent operators of invariant differentiation.
