In mathematics and theoretical physics, a large diffeomorphism is an equivalence class of diffeomorphisms under the equivalence relation where diffeomorphisms that can be continuously connected to each other are in the same equivalence class. For example, a two-dimensional real torus has a SL(2,Z) group of large diffeomorphisms by which the 1-cycles a , b {\displaystyle a,b} of the torus are transformed into their integer linear combinations.
In mathematics and theoretical physics, a large diffeomorphism is an equivalence class of diffeomorphisms under the equivalence relation where diffeomorphisms that can be continuously connected to each other are in the same equivalence class. For example, a two-dimensional real torus has a SL(2,Z) group of large diffeomorphisms by which the 1-cycles a , b {\displaystyle a,b} of the torus are transformed into their integer linear combinations.
Source: Wikipedia "Large diffeomorphism" · CC BY-SA 4.0
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