Which of the following phrases is correct or both are ok?

(1) "at least one of A and B"

(2) "at least one of A or B"

I first thought that (1) sounds more natural, but later found (2) on some websites.

Mimi

(1) "at least one of A and B"

(2) "at least one of A or B"

I first thought that (1) sounds more natural, but later found (2) on some websites.

Mimi

They are different propositions, Mimi.

(1) "at least one of A and B" = one of both A and B, as a minimum, so 2 'things' as a minimum.

(2) "at least one of A or B" = either one A or one B, as a minimum, so 1 'thing' as a minimum.

(1) "at least one of A and B" = one of both A and B, as a minimum, so 2 'things' as a minimum.

(2) "at least one of A or B" = either one A or one B, as a minimum, so 1 'thing' as a minimum.

Comments

I appreciate your help again!!

Mimi

anonymousAt least one "A and B" would mean one or more "A and B" as he writes.

But at least one

OFA and B means A alone, or B alone, or both.anonymousMister MicawberHistorically, "or" was considered ambiguous, so the language "one of A and B" was used as a substitute for just "A or B", not for "one of A or B". The law seems to have shifted, at least as far as the USPTO is concerned, so that "or" is now acceptable and "one of A and B" is now disfavored. I wonder if the courts agree with the USPTO?

anonymousAt least one of A or B means "either A or B or both".

At least one of A and B means exactly the same.

However, the former is more natural (to me, a native English speaker, with more than 40 years of experience, and with brilliant English). The former should be used. A google search confirms it is the more common version.

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