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I was studying this paper, where the authors consider an $SU(2)$ gauge field of instanton number 1 on a 4-sphere $M =S^4$. If $n_L$ is the number of zero modes of $\psi_L$ and $n_R$ is the number of zero modes of $\psi_R$, then the authors mention that by using Atiyah-Singer theorem,

$$n_L - n_R = 1.$$

Can somebody elaborate why this is so?

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