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2. 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 ). It can be proven that the trace of a matrix is the sum of its eigenvalues (counted with ...

3. 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. It can be a printed page that a child ...

4. Tracing paper - Wikipedia

   en.wikipedia.org/wiki/Tracing_paper

   Tracing paper is paper made to have low opacity, allowing light to pass through. Its origins date back to at least the 1300s where it was used by artists of the Italian Renaissance. [1] In the 1880s, tracing paper was produced en masse, used by architects, design engineers, and artists. [2] Tracing paper was key in creating drawings that could ...

5. D'Nealian - Wikipedia

   en.wikipedia.org/wiki/D'Nealian

   D'Nealian. The D'Nealian Method (sometimes misspelled Denealian) is a style of writing and teaching handwriting based on Latin script which was developed between 1965 and 1978 by Donald N. Thurber (1927–2020) in Michigan, United States. Building on his experience as a primary school teacher, Thurber aimed to make the transition from print ...

6. I, Pencil - Wikipedia

   en.wikipedia.org/wiki/I,_Pencil

   I, Pencil: My Family Tree as Told to Leonard E. Read, commonly known as I, Pencil, is an essay by Leonard Read and it was first published in the December 1958 issue of The Freeman. [1] "I, Pencil" is written in the first person from the point of view of a pencil. The pencil details the complexity of its own creation, listing its components ...

7. Tracing garbage collection - Wikipedia

   en.wikipedia.org/wiki/Tracing_garbage_collection

   Tracing garbage collection. In computer programming, tracing garbage collection is a form of automatic memory management that consists of determining which objects should be deallocated ("garbage collected") by tracing which objects are reachable by a chain of references from certain "root" objects, and considering the rest as "garbage" and ...