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Let's assume that I want to define the concept of injective function:

A function f is said to be injective if each element of the domain has at most one image.

which would become something like that:

函数{かんすう}fによって定義域のおのおののxに対して像が一個以下であるなら、函数fが単射であるという。

But is there something like 少なくとも一個 (at least one) whose meaning would be at most one. By something like 少なくとも I mean that the word order should be the same (ie. (expression whose meaning is “at most”)一個).

  • Even if I used the [mathematics] tag, I also welcome non mathematical jargon. – 永劫回帰 Mar 6 '16 at 5:41
  • @choco, “has” sorry for the confusing typo. – 永劫回帰 Mar 6 '16 at 5:59
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In the context of mathematics, 「高々 (or たかだか) 一個」 is the standard expression.

高々 can also be used in non-technical context, but it's somewhat formal. In daily conversations, we'd say "多くて(も)一個" or "最大で一個", etc.

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