Geodesic
Tensor roots of isomorphisms and weak limits of transformations
Matematičeskie zametki, Tome 80 (2006) no. 4, pp. 596-600

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We prove that two transformations $S$ and $T$ are isomorphic if their Cartesian squares are isomorphic, under the assumption that the sequence of powers of $T$ converges weakly to a polynomial. 
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     author = {V. V. Ryzhikov and A. E. Troitskaya},
     title = {Tensor roots of isomorphisms and weak limits of transformations},
     journal = {Matemati\v{c}eskie zametki},
     pages = {596--600},
     publisher = {mathdoc},
     volume = {80},
     number = {4},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2006_80_4_a12/}
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V. V. Ryzhikov; A. E. Troitskaya. Tensor roots of isomorphisms and weak limits of transformations. Matematičeskie zametki, Tome 80 (2006) no. 4, pp. 596-600. http://geodesic.mathdoc.fr/item/MZM_2006_80_4_a12/