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There is a sentence saying "If they don't have A or both B and C,"

I interpret it means "If they have no A or if they have neither B or C". Am I correct?

The condition seems to me that having only B or C alone is not enough, but having A alone is OK and having both B and C is OK too even if A is missing. I am not sure.

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  • Why should "average readers" be able to figure out what an ambiguous assertion means?
    – GEdgar
    Jul 24, 2019 at 17:01
  • I would AND the B and C in your interpretation. Jul 24, 2019 at 17:14
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    I don’t see how your first interpretation could be possible. Only possible interpretation to me is that the condition is that they must have either A or they must have both B and C. Having only one of B or C alone would not be enough, so “if they have no A or if they have neither B [n]or C” is not enough. Jul 24, 2019 at 17:14

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I don't believe you're correct, but your re-statement of the condition is even more obscure.

The verb is only mentioned once, so it must apply to both conditions. There are two conditions, because there is an or and the and is part of "both B and C" — the both links B and C together.

The statement can't actually be reduced any more, but let's say it's

If they don't have A or both B and C, then X.

  • If they don't have A, then X
  • If they don't have both B and C, then X

The way to prevent X is to have either A or both B and C together. A real-world example is needing identification: you can get a discount with either a photocard driving licence (showing name, address and photo) or both a passport (name and photo) and a utility bill (name and address).

It would certainly be easier to say "X unless they have A or both B and C."

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    That's the way I read it, for example, "If they don't have any matches, or both a flint and a steel, they won't be able to make a fire." Jul 24, 2019 at 17:21
  • WeatherVane -- Nice use of a real-world example!
    – user8356
    Jul 24, 2019 at 17:25
  • @user8356 real olde-world perhaps ;) Jul 24, 2019 at 17:31
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    @WeatherVane Thanks. I added a slightly more modern example.
    – Andrew Leach
    Jul 24, 2019 at 19:58
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Above-average reader parses it this way.

I can have thing A. I can have both things B and C. I could actually have all 3 things.

Any of those would meet the condition. Having only thing B without thing C does not meet the condition.

If this was written as a pseudo-code query for a database:

(If A) OR (If B AND C), then proceed...

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