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2. Locard's exchange principle - Wikipedia

   en.wikipedia.org/wiki/Locard's_exchange_principle

   Dr. Edmond Locard (1877–1966) was a pioneer in forensic science who became known as the Sherlock Holmes of Lyon, France. [ 1] He formulated the basic principle of forensic science as: "Every contact leaves a trace". It is generally understood as "with contact between two items, there will be an exchange."

3. Trace (linear algebra) - Wikipedia

   en.wikipedia.org/wiki/Trace_(linear_algebra)

   Trace (linear algebra) In linear algebra, the trace of a square matrix A, denoted tr (A), [ 1] is defined to be the sum of elements on the main diagonal (from the upper left to the lower right) of A. The trace is only defined for a square matrix ( n × n ). In mathematical physics texts, if tr (A) = 0 then the matrix is said to be traceless.

4. Field trace - Wikipedia

   en.wikipedia.org/wiki/Field_trace

   The trace form is used in algebraic number theory in the theory of the different ideal. The trace form for a finite degree field extension L/K has non-negative signature for any field ordering of K. [8] The converse, that every Witt equivalence class with non-negative signature contains a trace form, is true for algebraic number fields K. [8]

5. List of micronutrients - Wikipedia

   en.wikipedia.org/wiki/List_of_micronutrients

   Choline. Vitamin A (e.g. retinol (see also - provitamin A carotenoids)) Vitamin C (Ascorbic acid) Vitamin D. Ergocalciferol. Cholecalciferol. Vitamin E ( tocopherols and tocotrienols) Vitamin K. Vitamin K 1 (phylloquinone)

6. 7 Historical Dog Breeds Who Unfortunately No Longer Exist

   www.aol.com/7-historical-dog-breeds...

   Sadly, the Alpine Mastiff's numbers dwindled due to crossbreeding with other large breeds, such as the Saint Bernard and the English Mastiff. By the late 19th century, the purebred Alpine Mastiff ...

7. Worksheet - Wikipedia

   en.wikipedia.org/wiki/Worksheet

   A worksheet, in the word's original meaning, is a sheet of paper on which one performs work. They come in many forms, most commonly associated with children's school work assignments, tax forms, and accounting or other business environments. Software is increasingly taking over the paper-based worksheet.