Geodesic
Nearly Open, According to a Subset, Linear Maps Which are Open
Canadian mathematical bulletin, Tome 27 (1984) no. 1, pp. 96-101

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For a linear map we introduce two notions of being open according to a subset. With these two definitions, we characterize the linear, nearly open mappings which are open. Thus we generalize a famous theorem of V. Pták.
DOI : 10.4153/CMB-1984-014-3
Mots-clés : 46A30 
Pomerol, J. Ch. Nearly Open, According to a Subset, Linear Maps Which are Open. Canadian mathematical bulletin, Tome 27 (1984) no. 1, pp. 96-101. doi: 10.4153/CMB-1984-014-3
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