*Accepted Paper*

**Inserted:** 16 jul 2018

**Last Updated:** 28 mar 2019

**Journal:** Geom. Flows

**Year:** 2018

**Abstract:**

We classify four-dimensional shrinking Ricci solitons satisfying $Sec \geq \frac{1}{24} R$, where $Sec$ and $R$ denote the sectional and the scalar curvature, respectively. They are isometric to either $\mathbb{R}^{4}$ (and quotients), $\mathbb{S}^{4}$, $\mathbb{RP}^{4}$ or $\mathbb{CP}^{2}$ with their standard metrics.

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