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?
Asked
Active
Viewed 463 times
12
-
4From [this](http://japanese.stackexchange.com/a/30843/3275) answer: [数式記号の読み方・表し方](http://izumi-math.jp/sanae/report/suusiki/suusiki.htm). – blutorange Mar 05 '16 at 16:40
-
3It's perfectly okay to ask questions of this nature on Japanese.SE :-) – Mar 05 '16 at 19:08
-
1We need some word to express this. – user4092 Mar 06 '16 at 13:05
-
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． – Yosh Mar 07 '16 at 05:18
-
I participate in math stack exchange, english and japanese wiki.I can say mathematical expression are almost same all over the world. – Takahiro Waki Mar 09 '16 at 11:35
2 Answers
10
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
Earthliŋ
- 47,707
- 9
- 125
- 198
-
3+1 for a mathematician on this site. :) It's interesting that the wikipedia page on limits [極限](https://ja.wikipedia.org/wiki/%E6%A5%B5%E9%99%90) does not explain how to read the notation while the English version does. Hmmm. Though you could perhaps infer it from the context. – A.Ellett Mar 05 '16 at 16:30
5
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.
