Arithmetic properties of the $\ell$-regular partitions

For a given prime $p$, we study the properties of the $p$-dissection identities of Ramanujan's theta functions $ψ(q)$ and $f(-q)$, respectively. Then as applications, we find many infinite family of congruences modulo 2 for some $\ell$-regular partition functions, especially, for $\ell=2,4,5,8,13,16$. Moreover, based on the classical congruences for $p(n)$ given by Ramanujan, we obtain many more congruences for some $\ell$-regular partition functions.

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