For example on this wikipedia page:
一方、右辺第二項は R → ∞ のとき 0 に収束するので、...
In English it would be something like "as R goes to infinity". How would you usually read this in Japanese?
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4From this answer: 数式記号の読み方・表し方.– blutorangeMar 5, 2016 at 16:40
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3It's perfectly okay to ask questions of this nature on Japanese.SE :-)– user1478Mar 5, 2016 at 19:08
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1We need some word to express this.– user4092Mar 6, 2016 at 13:05
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4俗には "R を無限大に飛ばすとき" という言い方もありますね．– YoshMar 7, 2016 at 5:18
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I participate in math stack exchange, english and japanese wiki.I can say mathematical expression are almost same all over the world.– Takahiro WakiMar 9, 2016 at 11:35
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2 Answers
R → ∞
is usually read
R を限りなく大きくする［と・とき］
R が限りなく大きくなる［と・とき］
I don't think that 「R → ∞ のとき」 is supposed to have a fixed natural pronunciation. You can ignore the の and read it as above, or you could probably read it as
[R]{アール} [→]{トゥ} [∞]{インフィニティ} のとき
[R]{アール} [→]{ツー} [∞]{インフィニティ} のとき
answered Mar 5, 2016 at 16:25
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3
In Japanese,
- R is pronounced aaru (アール)
- → is pronounced yajirusi (矢印【やじるし】)
- ∞ is pronounced mugendai (無限大【むげんだい】)
I think "n→∞" is often pronounced as follows in the differential and integral.
- エヌ矢印無限大 enu yajirusi mugendai
- エヌ無限大 enu mugendai
where enu (エヌ) means the letter N.
Therefore I guess that "R→∞" is pronounced in the same way.
Although, because it is terminology, I guess it does not have a clear colloquial pronunciation.
It seems that there are some people who call it aaru twu infinithi (R to infinity) in Japanese English.
