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.

In[25]:=

  ?Quotient

  Quotient[n, m] gives the integer

     quotient of n and m, defined as

     Floor[n/m].

  

  

  

  

  

  

  ;[o]

  Quotient[n, m] gives the integer

     quotient of n and m, defined as

     Floor[n/m].

More detailed information can be obtained by using ??.

In[26]:=

  ??Mod

  Mod[m, n] gives the remainder on

     division of m by n. The result

     has the same sign as n.

  Attributes[Mod] = 

    {Listable, Protected}

  

  

  

  

  

  

  ;[o]

  Mod[m, n] gives the remainder on

     division of m by n. The result

     has the same sign as n.

  Attributes[Mod] = 

    {Listable, Protected}

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*

In[27]:=

  ?Div*

  Divide

  DivideBy

  DivisionFreeRowReduction

  Divisors

  DivisorSigma

  

  

  

  

  

  

  

  ;[o]

  Divide

  DivideBy

  DivisionFreeRowReduction

  Divisors

  DivisorSigma

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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