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<p>In this case, the inner product of two eigenstates is given by , where  denotes the <a href="page.php?w=Kronecker_delta">Kronecker Delta</a>. However, <br/>
* for a <b>continuum</b> of eigenstates forming a continuous basis, any state is an <a href="page.php?w=integral">integral</a>  where c(?) is a complex function such that c(?)<sup>2</sup> = c(?)<sup>*</sup>c(?) is the probability of measuring the state , and there is an <a href="page.php?w=uncountably_infinite">uncountably infinite</a> set of eigenvalues a. In this case, the inner product</p><p>
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