Lemma 4.28 Let Sp 1 ; Sp 2 2 Sx, Then Sp 1 S Sp 2 , 8n 2 in : Sp 1 N Sp 2 . 2
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چکیده
28 6 Acknowledgements We thank Prof. K. Indermark (Lehrstuhl f ur Informatik II / RWTH-Aachen) for his support and kind hospitality. Thanks also to Paz for her help.
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تاریخ انتشار 1990