How to pronounce "R → ∞ " in a mathematical context


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?




> 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




> 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

