next | previous | forward | backward | up | top | index | toc | Macaulay2 website
Posets :: isConnected(Poset)

isConnected(Poset) -- determines if a poset is connected



The poset $P$ is connected if the number of connectedComponents is $1$. Equivalently, the poset $P$ is connected if between every pair of vertices in $P$ there exists a chain of relations going from one to the other.

The divisorPoset of $n$ is always connected.

i1 : isConnected divisorPoset 18

o1 = true

The disjoint union of any two posets on disjoint vertex sets is disconnected.

i2 : C = chain 3;
i3 : P = sum(5, i -> naturalLabeling(C, 10*i));
i4 : isConnected P

o4 = false

See also

Ways to use this method: