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How do I express a chronological dependency between two events? Is it alright to say :

"Event A must be chronologically after Event B"?

Any suggestions are welcome.

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up vote 5 down vote accepted

Follow, postdate and succeed are antonyms of precede.

The meaning of postdate is different from what you seek, so you are left with

  • Event A must follow Event B
  • Event A must succeed Event B

Though the meaning is not strictly the same to your example, as both of these also imply that Event A causes Event B, where your original statement does not. Therefore, the same meaning would be

  • Event A, if it occurs, must occur after Event B

Chronologically is implied with after.

Finally, to say

  • Event B can not precede Event A

would mean the same as original statement.

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+1 Nice answer! – Thursagen Aug 2 '11 at 8:38

Events, by definition, take place, (rather than just existing), which automatically locates them in time. So saying "Event A must take place after Event B" is both idiomatic and precise.

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It is not so precise, it is rather ambiguous; it can mean 1) Event B implies Event A i.e. every time Event B occurs it will cause Event A to occur 2) Event A always occurs chronologically after Event B, but does not need to occur every time Event B occurs – Unreason Aug 2 '11 at 8:29
@Unreason: It's ambiguous about whether B always implies A but that wasn't what the question asked; it is totally unambiguous about the fact that A requires B. – Mr. Shiny and New 安宇 Aug 2 '11 at 12:14
@Mr. Shiny, exactly! And... since OP did not specify what is it that original statement is trying to convey it is not clear if the answer is adequate. – Unreason Aug 2 '11 at 13:57

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