Getting Help

Mathematica has extensive online help to access information about functions
and commands. The ? operator can be used for getting help. If a function
is prefixed with ?, then Mathematica prints usage information.


  ?Quotient

More detailed information can be obtained by using ??.


  ??Mod

If you don't know the name of a command, then you can
search by using a * in the command name. For example,
to find all commands beginning with Div, use ?Div*


  ?Div*

Exercise: Find out what DivisorSigma does and use to verify that 2305843008139952128
is a perfect number. You can also use Divisors to find the divisors of the number and
FactorInteger to find the prime factorization.

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