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Online Math Dictionary: U
Easy to understand math definitions for K-Algebra mathematics
Just scroll down or click on the word you want and I'll scroll down for you!

undefined

undefined slope

union of sets

Undefined
If the denominator of a fraction is 0, then the fraction is undefined.

$undefined fraction 2/0$

Undefined Slope
Vertical lines have slopes that are called undefined. This is because, when you try to find the slope given any two points on the line, you always get a zero in the denominator (for the run):

slope = rise / run = rise / 0

For more info on slopes and vertical lines, check out my lessons on lines.

line with an undefined slope

Union of Sets
The union of two sets is a set of ALL the elements of the two sets. (You don't write the reruns down twice.)
Example: A = { 1, 2, 3, a, b, c } B = { 3, 4, 5, b, c, f, g }
The union is A U B = { 1, 2, 3, 4, 5, a, b, c, f, g }

no
J's

no
X's

no
Y's

no
Z's

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