topological space. It is a completely regular Hausdorff space (also called Tychonoff space) that is not normal. It is named after Robert Lee Moore and Viktor
DescriptionOleinik and Tikhonov.jpg English: Olga Arsenievna Oleinik and Andrey Nikolayevich Tychonoff 1976. Deutsch: Olga Arsenjewna Oleinik und Andrei