CHICAGO - The Chicago Public Schools yesterday filed a lawsuit in Cook County Circuit Court against Illinoisthat contends its teachers pension funding mandate is unconstitutional because the state has failed to meet its obligation to provide more cash for CPS' teachers fund.

The state's largest school district, which is the only one to manage its own pension fund for teachers, believes the state's system lacks equity because of a higher percentage of funding allocated to the statewide Teachers' Retirement System pension fund.

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