Mathematica 9 is now available
THIS IS DOCUMENTATION FOR AN OBSOLETE PRODUCT.
SEE THE DOCUMENTATION CENTER FOR THE LATEST INFORMATION.
Wolfram Mathematica Documentation Center
DOCUMENTATION CENTER SEARCH
New to Mathematica? Find your learning path »
Mathematica > Mathematics and Algorithms > Formula Manipulation > Assumptions and Domains > Reals >
BUILT-IN MATHEMATICA SYMBOLTutorials »|See Also »|More About »

Reals

Reals
represents the domain of real numbers, as in .
MORE INFORMATION
  • evaluates immediately only if x is a numeric quantity.
  • Simplify can be used to try to determine whether an expression corresponds to a real number.
  • Within Simplify and similar functions, objects that satisfy inequalities are always assumed to be real.
EXAMPLESCLOSE ALL
Basic Examples   (3)
is a real number:
If is a real number, so is :
Find real solutions of an equation:
is a real number:
In[1]:=
Click for copyable input
Out[1]=
 
If is a real number, so is :
In[1]:=
Click for copyable input
Out[1]=
 
Find real solutions of an equation:
In[1]:=
Click for copyable input
Out[1]=
Scope   (4)
Test domain membership of a numeric expression:
Make domain membership assumptions:
Specify the default domain over which a function should work:
TraditionalForm formatting:
Properties & Relations   (3)
Reals contains Rationals, Integers, and Primes:
Reals is contained in Complexes:
Reals neither contains nor is contained in Algebraics:
New in 4
Ask a question about this page  |  Suggest an improvement  |  Leave a message for the team
Format:   HTML  |  CDF