# Section 8.12.1.3:
$ADD_OPS

plus( other : NTP ) : NTP ; -- This routine returns the value which is the sum of self and other, -- provided that that is representable in the appropriate number domain. minus( other : NTP ) : NTP ; -- This routine returns the value which is the arithmetic difference -- between self and other, provided that that is representable in the -- appropriate number domain.

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