Hi,

In message "[ruby-talk:15250] Re: class << self"
    on 01/05/16, Hans-Dieter Stich <hdstich / commplex-media.de> writes:

|btw. i didn't find 'define' and 'undefine' in the pickaxe
|book. what do you mean with these two words? does 'undefine'
|stand for 'undef_method'?

They are "def" and "undef" respectively.  Description of "undef"
keyword is accidentally ommitted in pixaxe book.  It works just like
"undef_method".

							matz.