On causal ω2-systems
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摘要
Two-dimensional systems are considered as a generalization of ordinary concept in systems theory, and the unsolvability of some decision problems on the systems are shown.
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论文评审过程：Received 12 May 1973, Available online 27 December 2007.
论文官网地址：https://doi.org/10.1016/S0022-0000(75)80044-4
