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Since the introduction of sheaves into mathematics in the 1940s, a major theme has been to study a space by studying sheaves on a space. T ....pdf Toposes pour les vraiment nuls.]" Elementary and even more elementary introductions to toposes as generalized spaces. ...

...ic position on the main sequence for most of their lives. In the 1930s and 1940s, with an understanding of hydrogen fusion, came an evidence-backed theory o [[Category:1910 introductions]] ...

...a starting point, with Celsius being defined (from the [[1740s]] to the [[1940s]]) by calibrating a thermometer such that: ...n occur only at a single pressure and only at a single temperature. By the 1940s, the triple point of water had been experimentally measured to be about 0.6 ...

[[Category:1940s neologisms]] [[Category:1949 introductions]] ...

...e have been new infestations {{endash}} mostly suspected to be independent introductions {{endash}} in [[Canyon Lake (California)|Canyon Lake, Riverside County]] in ...San Francisco]] area in the 1930s and [[Gilroy, California|Gilroy]] in the 1940s.<ref name=McDonald>{{Cite web |url=http://pnva.org/files/files/WhiterotPNWV ...