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2. Eigenvalues and eigenvectors - Wikipedia

   en.wikipedia.org/wiki/Eigenvalues_and_eigenvectors

   Eigenvalues and eigenvectors. In linear algebra, an eigenvector (/ ˈaɪɡən -/ EYE-gən-) or characteristic vector is a vector that has its direction unchanged by a given linear transformation. More precisely, an eigenvector, , of a linear transformation, , is scaled by a constant factor, , when the linear transformation is applied to it: .

3. Entropy - Wikipedia

   en.wikipedia.org/wiki/Entropy

   Entropy is a scientific concept that is most commonly associated with a state of disorder, randomness, or uncertainty. The term and the concept are used in diverse fields, from classical thermodynamics, where it was first recognized, to the microscopic description of nature in statistical physics, and to the principles of information theory.

4. Henry Winkler - Wikipedia

   en.wikipedia.org/wiki/Henry_Winkler

   —Henry Winkler describing how his parents escaped from Nazi Germany. From an interview with Terry Gross on NPR's Fresh Air in 2019. Winkler's parents, Ilse Anna Marie (née Hadra) and businessman Harry Irving Winkler were German Jews living in Berlin during the rise of Nazi Germany. By 1939, rising hostilities against Jews led his father to conclude that it was time to leave Germany. He ...