“[You may say that it is a question on Rav Moshe, but it is solely a question on you. Rav Moshe is saying that all these numbers are just short math for coming to the chiddush in his first teshuva. And it doesn’t matter the exact count because once we get close to this number we have no precedent for building eruvin, as Rav Moshe showed from the Yerushalmi (After he already proved the concept. Which you never addressed because you {possibly or purposely or purportedly} misread the major teshuva as a bunch of disjointed parts.)”
Its not a question because Rav Moshe was not changing anything from Manhattan. No such a thing as short math. You are making up concepts that don’t exist. Rav Moshe clearly maintained that the number is three million, otherwise he maintained it would be gezeira, because people may think that the area contained a population of three million. According to your am haratzus, Rav Moshe should have said who cares if the area contained a population of three million, the number three million is only short math. Instead Rav Moshe admitted that if the population is less than his requirement, the matter is only a gezierah. Furthermore, according to your shetusim, that the number is 600,000, why did Rav Moshe admit that they built eruvin in pre WWII Europe within cities containing a population of 600,000. What proof was there from Yerushalyim, there was precedent pre WWII Europe. I don’t have to answer Rav Moshe’s raya from Yerushalyim, as there are other gedolim who answered, before Rav Moshe (actually the raya is not strong at all, as there are Rishonim that state they made eruvin for parts of Yerushalyim, so who says that it was a chiyuv at that time to make an eruv for the entire ir hakodesh). If this chiddush of Yerushlayim pertains to Brooklyn as well, there is a short answer. Even though Rav Moshe did mention this issue in Brooklyn he only states that it could possibly be a problem in Brooklyn, but he is not sure. In Manhattan Rav Moshe wrote explicitly that once the eruv was established the issue of Yerushalyim was not an issue, how much more so in Brooklyn where he was not even sure if he could use the argument of Yerushlayim at all.
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