Date: 2023-02-11 | Article ID: 79649 |

Article 10142 introduced the idea of the **renormalization group** in quantum field theory. In colloquial terms, the renormalization group describes how a model changes when we "zoom out." Article 22212 derived a system of ordinary differential equations that describe how the coefficients in the action of a scalar quantum field change under the flow of the renormalization group. This article uses those flow equations to study which parts of the action are **relevant** (becoming more important at lower resolution) and which parts are **irrelevant** (becoming less important at lower resolution) with respect to the **trivial fixed point**, where interactions are absent.

**2023-02-11**(replaced a link in a footnote with a proper citation)**2023-02-10**(first version)

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