Paint cannot be red and blue as these are mutually exclusive. It cannot be night and day as these are mutually exclusive.
However unlike paint, which can be neither red nor green (for example: blue), it's always night or day. It can impossibly be not night and not day.
Mutually exclusive indicates the impossibility of terms being true at the same time.
Is there a similar expression for the impossibility of terms being false at the same time?
(edit) Note that the expression or phrase I'm looking for, e.g. "these things are xxx" would be equal to saying that their opposites are mutually exclusive.
This is fundamentally different than saying "these things are not mutually exclusive" or "these things are mutually inclusive" (which both mean the things can co-exist, but don't rule out the possibility of none existing).
Saying things are mutually exclusive means at most one can occur. What I'm looking for should indicate that at least one must occur.