= Hard-wall and soft-turning-point WKB quantization
{title2=$\int_0^{x_{\rm t}}k(x)\,dx=(n+3/4)\pi$}
A <Dirichlet boundary condition> at a hard endpoint and a single smooth <classical turning point> give the leading <WKB quantization condition> $\int_0^{x_{\rm t}}k(x)\,dx=(n+3/4)\pi$, with $n=0,1,\ldots$. The phase differs from the two-soft-turning-point condition because the hard wall imposes an exact <wavefunction> zero rather than an <Airy function> connection phase. The <WKB validity condition> is still checked in the interior.
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