What is the difference between the two notations about mollifiers $\{ \rho_n \}$ and $ \rho_n $? I'm a little bit confused, I want to study convergence and limitations in $L^2(R^3)$
2026-04-01 00:23:41.1775003021
Differences between $\{ \rho_n \}$ and $ \rho_n $, mollifier
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If your reference is using this notation, it is using $\{ \rho_n \}$ to refer to the whole sequence and $\rho_n$ to refer to the $n$th element of the sequence.