My question is rather simple:
$F$ being a field, what is the meaning of "the closure of $F \cup \{a\}$ under $+,-,*,÷$"?
2026-04-25 23:08:00.1777158480
Closure of "F ∪ {a}" meaning
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It means all numbers you can construct using elements of $F \cup \{a\}$ and operations $+,-,*,\div$.