Template:Selected anniversaries/April 20: Difference between revisions

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File:Niels Steensen.png|link=Niels Steensen (nonfiction)|1650: [[Niels Steensen (nonfiction)|Niels Steensen]] publishes new class of [[Gnomon algorithm functions]] which detect and prevent [[crimes against mathematical constants]].
File:Oliver Cromwell by Samuel Cooper.jpg|link=Oliver Cromwell (nonfiction)|1653: [[Oliver Cromwell (nonfiction)|Oliver Cromwell]] dissolves the Rump Parliament.
File:Niels Steensen.png|link=Niels Steensen (nonfiction)|1654: Mathematician [[Niels Steensen (nonfiction)|Niels Steensen]] publishes new class of [[Gnomon algorithm functions]] which detect and prevent [[crimes against mathematical constants]].
File:Giuseppe Peano.jpg|link=Giuseppe Peano (nonfiction)|1932: Mathematician [[Giuseppe Peano (nonfiction)|Giuseppe Peano]] dies. He did pioneering work in mathematical logic and [[Set theory (nonfiction)|set theory]].
File:Giuseppe Peano.jpg|link=Giuseppe Peano (nonfiction)|1932: Mathematician [[Giuseppe Peano (nonfiction)|Giuseppe Peano]] dies. He did pioneering work in mathematical logic and [[Set theory (nonfiction)|set theory]].
File:Exponential-growth-diagram.svg|link=Crimes against mathematical constants|1932: New class of [[Crimes against mathematical constants]] exploits death of mathematician [[Giuseppe Peano (nonfiction)|Giuseppe Peano]].
File:Exponential-growth-diagram.svg|link=Crimes against mathematical constants|1932: New class of [[Crimes against mathematical constants]] exploits death of mathematician [[Giuseppe Peano (nonfiction)|Giuseppe Peano]].
File:Enrico Fermi 1943-49.jpg|link=Enrico Fermi (nonfiction)|1941: [[Enrico Fermi (nonfiction)|Enrico Fermi]] discovers new form of [[Gnomon algorithm]], reverses entire family of [[crimes against mathematical constants]].
File:Bay of Pigs.jpg|link=Bay of Pigs Invasion (nonfiction)|1961: Failure of the [[Bay of Pigs Invasion (nonfiction)|Bay of Pigs Invasion]] of US-backed Cuban exiles against Cuba.
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1535 – The sun dog phenomenon observed over Stockholm and depicted in the famous painting Vädersolstavlan.
1653 – Oliver Cromwell dissolves the Rump Parliament.
1862 – Louis Pasteur and Claude Bernard complete the experiment falsifying the theory of spontaneous generation.
1865 – Astronomer Angelo Secchi demonstrates the Secchi disk, which measures water clarity, aboard Pope Pius IX's yacht, the L'Immaculata Concezion.
1902 – Pierre and Marie Curie refine radium chloride.
1961 – Failure of the Bay of Pigs Invasion of US-backed Cuban exiles against Cuba.

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