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Topological extension of Calabi homomorphism and non-simpleness of the area-preserving homeomorphism group of two-disc

The paper contains a silly mistake in the usage of the equation (5.4) in the formula (6.5). Due to this mistake, the effect of the transfer map $phi$ is nullified. I am deeply sorry for not being very careful in my submission and making this mistake.

preprint2015arXivOpen access
Yong-Geun Oh
math.SGmath.DS
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Yong-Geun Oh

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