$fgf = f$, $gfg = g$, $fg$ not necessarily identity, what is this called?
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How is the Julia set of $fg$ related to the Julia set of $gf$?
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Why quasi-inverse functors are adjoint pairs? - MathOverflow
2016年11月3日 · Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
nt.number theory - Orbits in modular arithmetic - MathOverflow
Your transformations act on the projective line $\mathbb Z_p \cup\{\infty\}$, preserving the three points $0$, $1$, $\infty$.