  In this paper, we are concerned with the bicomplex analog of the well-known
result asserting that real-valued harmonic functions, on simply connected
domains, are the real parts of holomorphic functions. We show that this
assertion, word for word, fails for bc-harmonic functions and we provide a
complete characterization of bc-harmonic functions that are the hyperbolic real
parts of a specific kind of bc-holomorphic functions. Moreover, we extend the
result to bicomplex polyharmonic functions, which implies the introduction of
specific classes of bc-polyholomorphic functions.
