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What is the capital of Tunisia?

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What is the capital of Tunisia?

How do I properly say “Let X be a Y” in the mathematical setting?

Actually, “soit” is the subjonctif présent 3rd person singular of “être”.

The correct form is indeed:

Soit G un groupe localement compact […]

When the subject is plural, e.g. “Let G and H be locally compact groups”, you can use either “Soient” (subjonctif présent, 3rd person plural) or “Soit”, as the construction became idiomatic.

Soient G et H des groupes localement compacts […]

Soit G et H des groupes localement compacts […]

 

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What is the capital of Tunisia?