Jerzy Łoś
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Jerzy Łoś (March 22, 1920-June 1, 1998) was a Polish mathematician, logician, economist, and philosopher. He is best known for his work on ultraproducts, in particular for " Łoś' theorem", which states that any first-order formula is true in an ultraproduct if and only it is true in "most" factors (see ultraproduct for details).
In 1996 Łoś suffered from a severe brain stroke. He was thenceforward ill until his death in 1998.
