I use French notation for intervals, like ]x,y[
.
But the brackets behave funny --- they try to surround wrong thing, like
] x,y [∪] a,b [
Writing \left]x,y\right[\cup\left]a,b\right[
solves the problem in most cases. But I want these brackets to have the same size, but they become larger on something like ]a,B^c[
.
P.S. My question is closely related to "How to input open intervals", but not the same.