A Generalized Mean-Value Theorem.
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Juan Arias de Reyna (1988)
Monatshefte für Mathematik
Toshihiro Yamaguchi (2005)
Czechoslovak Mathematical Journal
We give an example of a space with the property that every orientable fibration with the fiber is rationally totally non-cohomologous to zero, while there exists a nontrivial derivation of the rational cohomology of of negative degree.
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