A necessary and sufficient condition is presented for the existence of a generalized proper rational inverse for nonsquare polynomial matrices. The condition is then proved to be equivalent to the absence of infinite decoupling zeros. This condition provides a simple test for the absence of infinite decoupling zeros in the polynomial fraction form. It can also be used to remove the infinite decoupling zeros in order to achieve a strongly irreducible system, and to provide a new look of the unimodular matrix operation effect at infinity, for the left and right polynomial fraction forms.
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