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A counterexample to the L2 estimate\left\| {XYu} \right\| \leqq C\left( {\left\| {X^k u} \right\| + \left\| {Y^k u} \right\| + \left\| u \right\|} \right) |
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| Authors: | Jarosław Wróblewski |
| Institution: | 1. Instytut Matematyczny Uniwersytetu Wroclawskiego, pl. Grunwaldzki 2/4, PL-50-384, Wroc?aw, Poland |
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