thematics.  In each example we describe
| a closed theory by a set of axioms.  Some classical results will be
| stated without proof.
|
| Chang &amp; Keisler, 'Model Theory', pages 36-37.
|
| C.C. Chang and H.J. Keisler, 'Model Theory',
| North-Holland, Amsterdam, Netherlands, 1973.

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</PRE>

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