The cyclotron frequency for protons is influenced by relativistic effects at higher energies, which cause the resonance frequency to decrease due to the increased mass in the denominator of the equation. Additionally, for stable vertical orbits, the vertical magnetic field must decrease as a function of the radius of the orbit. The Wikipedia article provides a satisfactory overview of cyclotron resonance, but it does not address these critical factors. Understanding these influences is essential for accurate calculations of cyclotron frequency. Comprehensive mathematical proof and explanation are necessary for a complete understanding of these concepts.