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2. Literal (mathematical logic) - Wikipedia

   en.wikipedia.org/wiki/Literal_(mathematical_logic)

   For example, if , and are variables then the expression ¯ contains three literals and the expression ¯ + ¯ ¯ contains four literals. However, the expression A ¯ C + B ¯ C {\displaystyle {\bar {A}}C+{\bar {B}}C} would also be said to contain four literals, because although two of the literals are identical ( C {\displaystyle C} appears ...

3. Propositional variable - Wikipedia

   en.wikipedia.org/wiki/Propositional_variable

   In mathematical logic, a propositional variable (also called a sentence letter, [1] sentential variable, or sentential letter) is an input variable (that can either be true or false) of a truth function. Propositional variables are the basic building-blocks of propositional formulas, used in propositional logic and higher-order logics.

4. First-order logic - Wikipedia

   en.wikipedia.org/wiki/First-order_logic

   The substitution rule states that for any φ and any term t, one can conclude φ[t/x] from φ provided that no free variable of t becomes bound during the substitution process. (If some free variable of t becomes bound, then to substitute t for x it is first necessary to change the bound variables of φ to differ from the free variables of t.)

5. Horn clause - Wikipedia

   en.wikipedia.org/wiki/Horn_clause

   A Horn clause with exactly one positive literal is a definite clause or a strict Horn clause; [2] a definite clause with no negative literals is a unit clause, [3] and a unit clause without variables is a fact; [4] A Horn clause without a positive literal is a goal clause.

6. Conjunctive normal form - Wikipedia

   en.wikipedia.org/wiki/Conjunctive_normal_form

   The not operator can only be used as part of a literal, which means that it can only precede a propositional variable. The following is a context-free grammar for CNF: CNF → (Disjunction) CNF; CNF → (Disjunction) Disjunction → Literal Disjunction; Disjunction → Literal; Literal → Variable; Literal → Variable; Where Variable is any ...

7. Fixed vs. variable interest rates: How these rate types work ...

   www.aol.com/finance/fixed-vs-variable-interest...

   Some investment products earn interest that works similarly to a variable rate. For example, floating-rate notes (FRNs) have rates based on the 13-week Treasury bill, plus a spread — similar to ...

8. Literal (computer programming) - Wikipedia

   en.wikipedia.org/wiki/Literal_(computer_programming)

   In computer science, a literal is a textual representation (notation) of a value as it is written in source code. [1] [2] Almost all programming languages have notations for atomic values such as integers, floating-point numbers, and strings, and usually for Booleans and characters; some also have notations for elements of enumerated types and compound values such as arrays, records, and objects.

9. IEC 61131-3 - Wikipedia

   en.wikipedia.org/wiki/IEC_61131-3

   IEC 61131-3 is the third part (of 10) of the international standard IEC 61131 for programmable logic controllers. It was first published in December 1993 [1] by the IEC; the current (third) edition was published in February 2013. [2] Part 3 of IEC 61131 deals with basic software architecture and programming languages of the control program ...