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For example on [this wikipedia
page](https://ja.wikipedia.org/wiki/%E7%95%99%E6%95%B0#.E7.95.99.E6.95.B0.E5.AE.9A.E7.90.86):

> 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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readings mathematics symbols
How to pronounce "R → ∞ " in a mathematical context
> 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
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2016-03-05T16:25:24.757
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answer
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.
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answer