👉 Rainer is a German mathematician and philosopher who has made significant contributions to the study of mathematical logic, especially in the areas of model theory and set theory. He was born on September 10, 1928, in Berlin, Germany, and passed away on April 15, 2004.
Rainer is known for his work in the field of model theory, where he developed a new approach to the study of models of first-order logic that has had
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