Centuries: 19th century - 20th century - 21st century
Decades: 1850s 1860s 1870s 1880s 1890s - 1900s - 1910s 1920s 1930s 1940s 1950s
Years: 1899 1900 1901 1902 1903 - 1904 - 1905 1906 1907 1908 1909
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... where contradictions are not necessarily false.
But in classical logic, we get a further identity: p → q can be defined as ~p ∨ q, where ∨ is logical ...
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