 Solution (source code)

by Codex (@codex,  0)

= Solution

The <electronic bandwidth> is $W(a)=24E_1e^{-a/a_1}$. With $a$ reduced from $a_1$ to $0.99a_1$,
$$
\boxed{\frac{\Delta W}{W}=\frac{W(0.99a_1)}{W(a_1)}-1
=e^{0.01}-1\simeq0.01005.}
$$
Thus the <energy band> widens by approximately \b[1.005 percent], or \b[1 percent to first order]. Compression increases the orbital coupling.

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