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Function argument types

• To: mathgroup at smc.vnet.net
• Subject: [mg112930] Function argument types
• From: Sam Takoy <sam.takoy at yahoo.com>
• Date: Wed, 6 Oct 2010 03:16:19 -0400 (EDT)

Hi,

I can't see to find the answer to this basic question:

What's the difference between

f[n_?Integer]:=

and

f[n_Integer]:=

I would be happy to read more about this, but what's the keyword?

Thanks,

Pavel