= Onno Pols
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<Onno Pols> developed a systematic teaching account of <stellar structure> and <stellar evolution>. His 2011 notes connect <hydrostatic equilibrium>, energy transport and stellar thermodynamics, including the distinct <adiabatic exponents> needed when gas and <radiation pressure> both contribute.<Stellar Structure and Evolution by Onno Pols>[Sections 3.3–3.4, especially the definitions of the adiabatic exponents]{ref}
For example, a derivative describing how <pressure> responds to compression is not interchangeable with one describing the <temperature> response. Distinguishing them makes stability and energy-transport calculations usable beyond a single fixed-index <ideal gas>.
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