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Sophus LieBorn 17 Dec 1842; died 18 Feb 1899 at age 56.Marius Sophus Lie was a Norwegian mathematician who made significant contributions to the theories of algebraic invariants, continuous groups of transformations and differential equations. Lie groups and Lie algebras are named after him. Lie was in Paris at the outbreak of the French-German war of 1870. Lie left France, deciding to go to Italy. On the way however he was arrested as a German spy and his mathematics notes were assumed to be coded messages. Only after the intervention of French mathematician, Gaston Darboux, was Lie released and he decided to return to Christiania, Norway, where he had originally studied mathematics to continue his work.
A young man was visiting his brother and sister-in-law for the holidays. As he arrived at their house he found his young nephew, Timmy, helping them bake some cupcakes.
After they were done, his sister-in-law allowed Timmy to put the icing on. When the boy had finished, he brought them to the table.
"The cupcakes look delicious, Tim." his uncle said. He took a bite and said, "Timmy these are so good."
As he finished cupcake and took another, he again complimented his little nephew. "The cupcakes look beautiful, Tim," his uncle said. "How did you get the icing so neat?"
His nephew replied, "It was easy. I just licked them."
The uncle turned pale. He pointed to the plate of cupcakes. "You licked all of these?"
Timmie replied, "Well no. After a while my tongue got tired, and I got the dog to help."