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<p>de&nbsp;Sitter and <a href="page.php?w=Albert_Einstein">Albert Einstein</a> worked closely together in <a href="page.php?w=Leiden">Leiden</a> in the 1920s on the spacetime structure of the universe. De&nbsp;Sitter space was also discovered, independently, and about the same time, by <a href="page.php?w=Tullio_Levi-Civita">Tullio Levi-Civita</a>.</p>

<p><big> Definition </big></p>
<p>A de&nbsp;Sitter space can be defined as a <a href="page.php?w=submanifold">submanifold</a> of a generalized <a href="page.php?w=Minkowski_space">Minkowski space</a> of one</p><p>
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