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مُساهمة  Admin في الجمعة يناير 14, 2011 2:15 am

Operations Symbols
+ Plus Sign, Positive Sign
Example 1: + , Plus Sign means add
15 "plus" 3 is 18
15 + 3 = 18
Example 2: +, Positive Sign means a number
is greater than zero
+15 is a positive number because
it is greater than zero

- Minus Sign, Negative Sign
Example 1: - , Minus Sign means subtract
15 "minus" 3 is 12
15 - 3 = 12
Example 2: : - , Negative Sign means a number
is less than zero
-9 is a negative number because
it is less than zero.

× Multiplication Sign, Cross Product of two vectors
Example 1: × , Multiplication Sign (used
Interchangeably with the raised dot
or Star )
21 "multiplied" by 3 is 63


Example 2: ×, Cross Product of Two Vectors
The cross product of two vectors is a new vector. ,
where D and E are the absolute values of the vectors D & E, and is
the unit vector perpendicular to the
plane formed by the vectors D & E
using the right hand rule.

• Multiplication Dot (raised dot), Dot Product of two vectors
Example 1:. , Multiplication Dot (used
interchangeably with the
multiplication sign or Star )
21 "multiplied" by 3 is 63


Example 2: ., Dot Product of Two Vectors
The dot product of two vectors does
not produce a new vector. The dot
product of two vectors produces a real
number (an ordinary number). ,
where D and E are the absolute
values of the vectors D & E.

* Star (Asterisk), generally stands for multiplication
Example 1: *, Multiplication Sign (used
interchangeably with the multiplication
sign or raised dot .)
21 "multiplied" by 3 is 63


÷ Division Sign
Example 1: ÷, Division Sign (used interchangeably
with the Forward Slash )
21 "divided" by 3 is 7



/ Forward Slash
Example 1: / , Forward Slash (used interchangeably
with the division sign )
21 "divided" by 3 is 7


-- Fraction Bar
Example 1: -- , Fraction Bar (Quotient)
the fraction

means 21 is "divided" by 3


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