### Dependent first order theories, continued

by Shelah. [Sh:783]

Israel J Math, 2009

A dependent theory is a (first order complete theory) T
which does not have the independence property. A major result
here is:
if we expand a model of T by the traces on it of sets definable in
a bigger model then we preserve its being dependent. Another one
justifies the cofinality restriction in the theorem (from a previous
work) saying that pairwise perpendicular indiscernible sequences,
can have arbitrary dual-cofinalities in some models containing
them. We introduce ``strongly dependent'' and look at definable
groups; and also at dividing, forking and relatives.

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