One transaction at a time would generallynot lead either to much work or muchbusiness, and besides, a transaction cannot always be completedwhile you wait. The consequence is that we arrive at a num-ber of transactions going on simultaneously. When we nowreach the stage of too much work, then we must find waysand means to supplement our energy. Thus we arrive at amultitude of transactions by means of concerted action.

It’s far more complicated than that, obviously. Different parts of this process are going on all the time. While working on one chapter, I’m also capturing and working on unrelated—for the time being at least—notes on other topics that interest me, including stuff that might well end up in future books.

It is not a bad plan for two or more students to meet at stated intervals and compare their notes . The lecture can be discussed so that thepoints omitted or not fully understood can be placed correctly in the notebook against the final test . The chance for error is greatly decreased inthis way and, besides , the discussion greatly aids the memory so that thework of studying from the notes is lessened . In at least one instance wherethe speaker delivered his lecture very rapidly several students arrangedto take his points in relays ; that is, since there was scarcely time for oneman to get all, one man could take the first point, another the second, andso on. These men occupied seats close together so that an exchange ofsignals was possible. Afterwards they discussed each lecture and puttheir notes together.

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Weak sequencing reduces to a parallel merge when the operands are on different sets of participants. Weak sequencing reduces to strict sequencing when the operands work on the same participant.

I recommend using the term “parallel” when the simultaneous execution is assured or expected, and to use the term “concurrent” when it is uncertain or irrelevant if simultaneous execution will be employed.

Concurrency is about dealing with lots of things at once. Parallelism is about doing lots of things at once.

A system is said to be concurrent if it can support two or more actions in progress at the same time. A system is said to be parallel if it can support two or more actions executing simultaneously.

Parallelism means that an application splits its tasks up into smaller subtasks which can be processed in parallel, for instance on multiple CPUs at the exact same time.

Concurrency means executing multiple tasks at the same time but not necessarily simultaneously.

Do you see the inference:—that pleasure and pain are simultaneous, when you say that being thirsty, you drink? For are they not simultaneous, and do they not affect at the same time the same part, whether of the soul or the body