# Thread: Strange notation for continuity

1. ## Strange notation for continuity

I just ran across a problem that has the following notation: $\displaystyle C_{0}^2[0, 1]$.

I already now what $\displaystyle C^2[0, 1]$ means. But what the heck is that subscript zero??

2. ## Re: Strange notation for continuity

Never mind, it was explained elsewhere in the problem. y(0) = y(1) = 0, hence the 0 in the continuity function.