# Frequency and Energy Levels

# Frequency and Energy Levels

This chapter shows how to measure the Hölder regularity of the weak solutions that are constructed when the scheme is executed more carefully. For this aspect of the convex integration scheme, a notion of frequency energy levels is introduced. This notion is meant to accurately record the bounds which apply to the (*v*, *p*, *R*) coming from the previous stage of the construction. The chapter presents an example of a candidate definition for frequency and energy levels. Based on this definition, the effect of one iteration of the convex integration procedure can be summarized in a single lemma, which states that there is a solution to the Euler-Reynolds equations with new frequency and energy levels. The chapter also considers the High–Low Interaction term and the Transport term.

*Keywords:*
convex integration, Hölder regularity, weak solution, frequency energy levels, Euler-Reynolds equations, High–Low Interaction term, Transport term

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