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2. Expression (mathematics) - Wikipedia

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

   For a given combination of values for the free variables, an expression may be evaluated, although for some combinations of values of the free variables, the value of the expression may be undefined. Thus an expression represents an operation over constants and free variables and whose output is the resulting value of the expression. [22]

3. Formula - Wikipedia

   en.wikipedia.org/wiki/Formula

   An example is boron carbide, whose formula of CB n is a variable non-whole number ratio, with n ranging from over 4 to more than 6.5. When the chemical compound of the formula consists of simple molecules , chemical formulas often employ ways to suggest the structure of the molecule.

4. Four square writing method - Wikipedia

   en.wikipedia.org/wiki/Four_Square_Writing_Method

   Four Square: Writing Method for Grades 4-6: Judith S. Gould and Evan Jay Gould: 9781573101899: 1999 Four Square: Writing Method for Grades 7-9: Judith S. Gould and Evan Jay Gould: 9781573101905: 1999 Four Square: The Total Writing Classroom for Grades 1-4: Judith S. Gould and Evan Jay Gould: 9781573103336: 2002 Four Square: The Total Writing ...

5. Chemical equation - Wikipedia

   en.wikipedia.org/wiki/Chemical_equation

   A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and chemical formulas.The reactant entities are given on the left-hand side and the product entities are on the right-hand side with a plus sign between the entities in both the reactants and the products, and an arrow that points towards the products to show the direction of the reaction. [1]

6. List of formulas in elementary geometry - Wikipedia

   en.wikipedia.org/wiki/List_of_formulas_in...

   Area#Area formulas – Size of a two-dimensional surface; Perimeter#Formulas – Path that surrounds an area; List of second moments of area; List of surface-area-to-volume ratios – Surface area per unit volume; List of surface area formulas – Measure of a two-dimensional surface; List of trigonometric identities

7. Glossary of chemical formulae - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_chemical_formulae

   C 6 H 4 ClNO 2: 2-chloronicotinic acid: 2942-59-8 C 6 H 4 ClN 3: 4-Chlorophenyl azide: C 6 H 4 ClNO 2: 6-chloro-2-pyridinecarboxylic acid: 4684-94-0 6-chloronicotinic acid: 5326-23-8 C 6 H 4 N 4: tricyanoaminopropene: C 6 H 4 O 2: orthobenzoquinone: 583-63-1 parabenzoquinone quinone: 106-51-4 C 6 H 5 Br: bromobenzene: 108-86-1 C 6 H 5 CHO ...

8. Propositional formula - Wikipedia

   en.wikipedia.org/wiki/Propositional_formula

   In propositional logic, a propositional formula is a type of syntactic formula which is well formed. If the values of all variables in a propositional formula are given, it determines a unique truth value. A propositional formula may also be called a propositional expression, a sentence, [1] or a sentential formula.

9. Help:Displaying a formula - Wikipedia

   en.wikipedia.org/wiki/Help:Displaying_a_formula

   Spaces within a formula must be directly managed (for example by including explicit hair or thin spaces). Variable names must be italicized explicitly, and superscripts and subscripts must use an explicit tag or template. Except for short formulas, the source of a formula typically has more markup overhead and can be difficult to read.