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2. Integral element - Wikipedia

   en.wikipedia.org/wiki/Integral_element

   In commutative algebra, an element b of a commutative ring B is said to be integral over a subring A of B if b is a root of some monic polynomial over A. [1]If A, B are fields, then the notions of "integral over" and of an "integral extension" are precisely "algebraic over" and "algebraic extensions" in field theory (since the root of any polynomial is the root of a monic polynomial).

3. Truth table - Wikipedia

   en.wikipedia.org/wiki/Truth_table

   Irving Anellis's research shows that C.S. Peirce appears to be the earliest logician (in 1883) to devise a truth table matrix. [4]From the summary of Anellis's paper: [4] In 1997, John Shosky discovered, on the verso of a page of the typed transcript of Bertrand Russell's 1912 lecture on "The Philosophy of Logical Atomism" truth table matrices.

4. QWERTY - Wikipedia

   en.wikipedia.org/wiki/QWERTY

   ANSI QWERTY keyboard layout (US) Remington 2 typewriter keyboard, 1878 A laptop computer keyboard using the QWERTY layout. QWERTY (/ ˈ k w ɜːr t i / KWUR-tee) is a keyboard layout for Latin-script alphabets.