Show, from equations (14.4.43) through (14.4.46), that for \(d \lesssim 4\)

\[
\eta \simeq \frac{1}{2 n} \varepsilon^{2}, \quad \gamma \simeq 1+\frac{1}{2}\left(1-\frac{6}{n}\right) \varepsilon, \quad \alpha \simeq-\frac{1}{2}\left(1-\frac{12}{n}\right) \varepsilon
\]

where \(\varepsilon=(4-d) \ll 1\). Check that these results agree with the ones following from equations (14.4.38) through (14.4.40) for \(n \gg 1\).