Reply To: New Brooklyn Eruv: Time to Accept?

Richmond Braun,
“B) only when it would not (which you state it doesn’t – just like KGH doesn’t).”
I did not want to get into it, but yes, any area that contains less than 600,000 can be encompassed by tzuras hapesachim according to Rav Moshe’s shitos. The main point is Rav Moshe believed at the time that a 12 mil by 12 mil section of Brooklyn contains a population of 3 million, and that each Boro Park and Flatbush contain a population greater than 600,000. Hence, he opposed an eruv for BP and Flatbush. This understanding is the only explanation as to why Rav Moshe allowed an eruv in Queens and Detroit, but did not allow in Brooklyn.