The Plurality of Persons in God

We are now led to consider the plurality of the persons: about which there are four points of inquiry:(1) Whether there are several persons in God?(2) How many are they?(3) What the numeral terms signify in God?(4) The community of the term "person."

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Whether there are several persons in God?
Whether there are more than three persons in God?
Whether the numeral terms denote anything real in God?
Whether this term "person" can be common to the three persons?