= Dynamics of Astrophysical Discs, Lecture 5: Boundary Conditions and Steady Accretion by Gordon I. Ogilvie
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Cambridge Mathematical Tripos Part III, Lent Term 2020, authored lecture 5. Section 5.2, printed pp.3–4, derives the zero-inner-torque steady disc and discusses <energy> transported by internal <torque>. The infinite-outer-radius <luminosity> formula must not be applied unchanged to an arbitrary finite annulus.
https://www.damtp.cam.ac.uk/user/gio10/dad5.pdf
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