Rigidity problem of the Liouville property of holomorphic functions on $\#^\vartheta\mathbb C^m$

All harmonic functions on $\mathbb C^m$ possess Liouville's property, which is well-known as the Liouville's theorem. In 1979, Kuz'menko and Molchanov discovered a phenomenon that the Liouville's property is not rigid for harmonic functions on the connected sum $\mathbb C^m\#\mathbb C^m,$ where there exist a large number of non-constant bounded harmonic functions. Their discovery piques our curiosity to know under which conditions harmonic functions must possess Liouville's property. In this paper, we prove that Cauchy-Riemann equation maintains the rigidity of Liouville's property for harmonic functions on $\#^\vartheta\mathbb C^m$ $(m\geq2)$ by generalizing the Nevanlinna theory to complete Kähler connected sums with non-parabolic ends, that is, every bounded holomorphic function on $\#^\vartheta\mathbb C^m$ $(m\geq2)$ is a constant. In fact, we obtain a stronger result that the Picard's little theorem holds for meromorphic functions on $\#^\vartheta\mathbb C^m$ $(m\geq2).$