MATH GLOSSARY
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Title 
Description 

Variable 
A Variable is a symbol, most often a letter, to represent a quantity that may change value, that is literally to vary in its value.


Vector 
Often represented with an arrow, a Vector is a quantity with both magnitude (size) and direction.


Vector Calculus 
A piece of multivariable (or multivariate) Calculus, Vector Calculus concerns itself with Vector fields, their derivatives and integrals, most often in threedimensional space.


Velocity 
Formally a vector in physics, Velocity has both magnitude (speed) and direction.


Venn Diagram 
Most often graphics of overlapping circles and ovals, a Venn Diagram depicts sets, subsets, and their intersections and unions.


Verify 
To confirm is to Verify. When we Verify, we prove or establish some assertion to a dependable conclusion independent from bias. There is wisdom in these words: "Trust, but Verify." 

Vertex 
A "corner" of a polygon is a Vertex; an extremum of a conic section is a Vertex; the endpoint(s) of rays that form an angle is a Vertex.


Vertical 
Straight up, perpendicular to horizontal, is Vertical. Vertical lines have an indeterminate or infinite slope.


Vertical Angles 
When two lines cross (intersect) they form two pairs of Vertical Angles; the Angles within each pair of Vertical Angles are congruent. 

Vertical Line Test 
Given a relation between x and y expressed as y = f(x), the relation is a function if the graph passes the Vertical Line Test; no vertical line may cross the graph more than once. No single element from the domain of x may generate more than a single value of y mapped into the range, to be considered a function. 

Volume 
The extent to which an object fills units of threedimensional space is its Volume.


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Math Glossary