Peter Walters An Introduction to Ergodic Theory Chapter 2 Page 66
What does the idea (Property P) mean ?
I couldn't understand it 
2026-03-25 20:34:19.1774470859
Spectral Invariants
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It is not referring to any specific property at all.
Rather, a property is said to be isomorphism invariant if, whenever $T_1$ has the property and $T_2$ is isomorphic to $T_1$, then $T_2$ has the property too.
The same goes for conjugacy invariant and spectral invariant.