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