1.AdjectiveOf a topological space
X
{\displaystyle X}
: such that it is a connected space and, for any closed, connected
A
,
B
⊂
X
{\displaystyle A,B\subset X}
with
X
=
A
∪
B
{\displaystyle X=A\cup B}
, the intersection
A
∩
B
{\displaystyle A\cap B}
is connected.
"Any closed interval on the real line is unicoherent, but a circle is not."