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2. List of companies by research and development spending

   en.wikipedia.org/wiki/List_of_companies_by...

   Expenditures on R&D (billions of US$) 1 Amazon United States: Software and Internet 42.74 2 Alphabet Inc. United States: Software and Internet 27.57 3 Huawei China: Computing and Electronics 22.04 4 Microsoft United States: Software and Internet 19.27 5 Apple United States: Computing and Electronics 18.75 5 Samsung Electronics South Korea

3. Moody chart - Wikipedia

   en.wikipedia.org/wiki/Moody_chart

   In engineering, the Moody chart or Moody diagram (also Stanton diagram) is a graph in non-dimensional form that relates the Darcy–Weisbach friction factor f D, Reynolds number Re, and surface roughness for fully developed flow in a circular pipe. It can be used to predict pressure drop or flow rate down such a pipe.

4. Bilinear form - Wikipedia

   en.wikipedia.org/wiki/Bilinear_form

   For modules (instead of vector spaces), just as how a nondegenerate form is weaker than a unimodular form, a nondegenerate pairing is a weaker notion than a perfect pairing. A pairing can be nondegenerate without being a perfect pairing, for instance Z × Z → Z via (x, y) ↦ 2xy is nondegenerate, but induces multiplication by 2 on the map Z ...