The union of flat $\left({n-1}\right)$-balls is flat in $R^n$
Kirby, Robion C.
Bull. Amer. Math. Soc., Tome 74 (1968) no. 6, p. 614-617 / Harvested from Project Euclid
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Publié le : 1968-05-14
Classification:  
@article{1183529649,
     author = {Kirby, Robion C.},
     title = {The union of flat $\left({n-1}\right)$-balls is flat in $R^n$},
     journal = {Bull. Amer. Math. Soc.},
     volume = {74},
     number = {6},
     year = {1968},
     pages = { 614-617},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1183529649}
}

Kirby, Robion C. The union of flat $\left({n-1}\right)$-balls is flat in $R^n$. Bull. Amer. Math. Soc., Tome 74 (1968) no. 6, pp.  614-617. http://gdmltest.u-ga.fr/item/1183529649/