Dokazuje se, že pozoruhodná nadplocha nalezená H. Takagim (jako první protipříklad k tzv. Nomizuově hypotéze o semi-symetrických prostorech) je lokálně tuhá. (cs)
We prove that the remarkable hypersurface found by H. Takagi in 1972 (as the first counter-example to the Nomizu conjecture on semi-symmetric spaces) is locally rigid.
We prove that the remarkable hypersurface found by H. Takagi in 1972 (as the first counter-example to the Nomizu conjecture on semi-symmetric spaces) is locally rigid. (en)