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isEmpty(RRi) -- empty test for an interval

Function: isEmpty
Usage:

x = isEmpty(I)
Inputs:
- I, a real interval,
Outputs:
- x, a Boolean value,

Description

Returns true if the input interval is empty, i.e., the left endpoint is to the right of the right endpoint.

i1 : isEmpty interval(1,2)

o1 = false

i2 : isEmpty interval(2,1)

o2 = true

i3 : isEmpty interval(1,2*ii)

o3 = true

See also

isMember -- test membership in a list or set

Ways to use this method:

isEmpty(CCi)
isEmpty(RRi) -- empty test for an interval

The source of this document is in Macaulay2Doc/doc_intervals.m2:220:0.