Symbols are
a concise
way of giving
lengthy
instructions
related to
numbers and
logic.
Symbols are
a communication
tool. Symbols
are used to
eliminate the
need to write
long, plain
language
instructions to
describe
calculations
and other
processes.
For example, a
single symbol
stands for the
entire process
for addition.
The familiar
plus sign
eliminates the
need for a long
written
explanation of
what addition
means and how
to accomplish
it.
The same
symbols are
used worldwide
. . .
The symbols
used in
mathematics are
universal.
The same math
symbols are
used throughout
the civilized
world. In most
cases each
symbol gives
the same clear,
precise meaning
to every
reader,
regardless of
the language
they speak.
The most
valuable,
most
frequently used
Symbols in
mathematics . .
.
The most
important, most
frequently used
Symbols for
Set
Notation
are listed
below.
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Math
Symbol for
the
"Intersection
of
Sets"

D
A
equals a
new set
which
includes
only those
common
elements
which
appear in
both Set
"D"
AND Set
"A".
This is similar
to the
intersection of
two streets.
The area of
overlap, where
the two streets
cross one
another, is the
intersection.
Example 1:
, Set
A:
A
=
{ a, b, c,
d
}
Set
D:
D
=
{ e, f
}
. . .
The
Intersection
of Set
"D"
and Set
"A"
produces
an
EMPTY
SET (a
NULL Set).
Set
"A"
and Set
"D"
have
no
elements
in
common
with one
another.
D
A
=
{}
D
A
=
Note:
Set
"A"
and
Set
"D"
are
called
Disjoint
Sets
because
they
have
no
common
elements.
Example 2:
, Set
B:
B =
{
1, 3, 9,
11
,
13,
14
}
Set
E:
E
=
{1,
3, 9,
11}
. . .
Both Set
"E"
and Set
"B"
contain
some of
the same
elements:
1, 3,
9, 11.
These
common
elements
are the
intersection
of the two
Sets.
E
B
= {1, 3,
9,
11}
Example 3:
, Set
C:
C = {dog,
horse,
bird,
rabbit,
cat
}
Set
F:
F
=
{cat,
rabbit}
. . .
Both Set
"F"
and Set
"C"
list the
following
elements
in a
different
order:
rabbit,
cat.
F
C
= {rabbit,
cat}
Note:
the
elements
within
a SET
can
be
listed
in
any
order.