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2. Sentence (mathematical logic) - Wikipedia

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

   A sentence can be viewed as expressing a proposition, something that must be true or false. The restriction of having no free variables is needed to make sure that sentences can have concrete, fixed truth values : as the free variables of a (general) formula can range over several values, the truth value of such a formula may vary.

3. Expression (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Expression_(mathematics)

   Expressions are often contrasted with statements—syntactic entities that have no value (an instruction). Representation of the expression (8 − 6) × (3 + 1) as a Lisp tree, from a 1985 Master's Thesis [48] Except for numbers and variables, every mathematical expression may be viewed as the symbol of an operator followed by a sequence of ...

4. List of logic symbols - Wikipedia

   en.wikipedia.org/wiki/List_of_logic_symbols

   Corner quotes, also called “Quine quotes”; for quasi-quotation, i.e. quoting specific context of unspecified (“variable”) expressions; [3] also used for denoting Gödel number; [4] for example “⌜G⌝” denotes the Gödel number of G. (Typographical note: although the quotes appears as a “pair” in unicode (231C and 231D), they ...

5. Propositional formula - Wikipedia

   en.wikipedia.org/wiki/Propositional_formula

   The predicate calculus goes a step further than the propositional calculus to an "analysis of the inner structure of propositions" [3] It breaks a simple sentence down into two parts (i) its subject (the object (singular or plural) of discourse) and (ii) a predicate (a verb or possibly verb-clause that asserts a quality or attribute of the object(s)).

6. Propositional calculus - Wikipedia

   en.wikipedia.org/wiki/Propositional_calculus

   Propositional logic, as currently studied in universities, is a specification of a standard of logical consequence in which only the meanings of propositional connectives are considered in evaluating the conditions for the truth of a sentence, or whether a sentence logically follows from some other sentence or group of sentences.

7. Spirit Airlines filed for bankruptcy. What does that mean for ...

   www.aol.com/spirit-airlines-filed-bankruptcy...

   NEW YORK (AP) — Spirit Airlines, the largest budget carrier in the U.S., filed for Chapter 11 bankruptcy protection Monday. The airline said customers should not see any disruption to their ...

8. Propositional function - Wikipedia

   en.wikipedia.org/wiki/Propositional_function

   In propositional calculus, a propositional function or a predicate is a sentence expressed in a way that would assume the value of true or false, except that within the sentence there is a variable (x) that is not defined or specified (thus being a free variable), which leaves the statement undetermined.

9. Spirit Airlines files for bankruptcy following mounting debt ...

   www.aol.com/news/spirit-airlines-files...

   The company's share price fell from $3.22 to $1.15 last week after the Wall Street Journal reported it was preparing to file for bankruptcy protection, closing on $1.07 on Friday.