Dictionary
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 identity
 A number that when an operation is applied to
a given number yields that given number. For multiplication, the identity is one and for
addition the identity is zero.
 indefinitely
 An unspecified amount, having no
exact limits (cf Infinity and Iteration
Discussion).
 independent events
 Two events A and B are independent if the probability that they happen at the same
time is the product of the probabilities that each occurs individually; i.e., if
P(A & B) = P(A)P(B). In other words, learning that one event occurs does not give any
information about whether the other event occurred too: the conditional probability
of A given B is the same as the unconditional probability of A, i.e., P(A/B) = P(A).
 infinity
 Greater than any fixed counting number, or extending forever. No matter how large a number one thinks of, infinity is larger than it. Infinity has no limits
(cf Infinity and Iteration Discussion).
 initiator
 A linesegment or figure that begins as the beginning geometric shape for a fractal. The initiator is then replaced by the generator for the fractal.
 input
 The number or value that is entered, for example, into a function machine. The
number that goes into the machine is the input (cf Functions as Processes or Rules Discussion).
 integer
 Any positive or negative number that does not include a fraction or decimal, including zero.
 intersection of sets
 The intersection of two or more sets is the set of elements that all the sets have
in common; in other words, all the elements contained in every one of the sets. The
mathematical symbol for intersection is
(cf Internet Search and Set Operations Discussion).
 intercept
 See xintercept or yintercept
(cfLinear Functions
Discussion).
 inverse, additive
 A number when added
to a given number yields zero. Also see identity.
 inverse, multiplicative
 A number when
multiplied by a given number yields one. Also see identity.
 irregular fractals
 Complex fractals whose dimension is often difficult to
determine and in some cases is unknown (cf Dimension for Irregular Fractals
Discussion).
 isosceles triangle
 A
triangle that has at least two congruent sides (cfTrapezoid Discussion).
 item
 The things or objects that are the subject of a bar graph (cf Class Interval: Scale and Impression Discussion).
 iteration
 Repeating a set of rules
or steps over and over. One step is called an iterate.
(cf Infinity and Iteration Discussion).
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