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ShinmenTakezo said:

This fifth edition of The Power of Logic offers an introduction to informal logic, traditional categorical logic, and modern symbolic logic. The authors’ direct and accessible writing style, along with a wealth of engaging examples and challenging exercises, makes this an ideal text for today’s logic classes.

Where's this mathematical logic?

http://catalogs.mhhe.com/mhhe/viewProductDetails.do?isbn=0078038197

The fact that you can't find the mathmatical logic in that summary shows you shouldn't be the one argueing this point.   "Symbolic Logic" is another term for Mathmatical Logic.  (So is Categorical, though a different kind)

http://en.wikipedia.org/wiki/Mathematical_logic

Informal isn't, but what he described wasn't informal logic.  (Since informal logic requires you find and disect the unstated assumptions... which is what i've been doing... while he's been saying we should ignore all unstated assumptions that might not hold true.)