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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I think "n→∞" is often pronounced as follows in the differential and integral.
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.