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|Modal Operators||I 205
Modal operator / problem of actuality / Field: Example, it is possible that a distance is twice or half:as big as it actually is - that can not be done by the possibility operator alone. - Incorrect solution: "actuality operator": which is to refer back to the actual world. - Modality: is used by the Relationism to express that double distance is possible, even if there is no matter point - The Substantivalism does not need that.
Modality / possibility // Physics / Field: a prefixed modal operator would change the content of a physical law. - ((s) which goes beyond the purely logical case p > Mp.)
Realism, Mathematics and Modality Oxford New York 1989
Truth and the Absence of Fact Oxford New York 2001
Science without numbers Princeton New Jersey 1980