The one-way behaviour we are studying here is “half” of the standard input-output behaviour. The latter is defined in terms of input-output paths, while the former uses all finite and infinite paths connecting one of the network interfaces. Actually, there are two dual versions of the one-way behaviour: the input behaviour,which considers all paths starting from the network’s inputs, and the output behaviour, which takes into account all the paths arriving at the network’s outputs.
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