PSL(2,p) satisfies the replacement property exactly for p in {7,11,19,31} and p congruent to 3 or -3 modulo both 8 and 10; however, the proof of the failure cases contains a false construction.
The Replacement Property of PSL$(2,p)$ and PSL$(2,p^2)$
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abstract
In 2014, Benjamin Nachman showed that when $p\equiv$1 mod 8, the 2-dimensional projective linear group over the field of $p$ elements fails the replacement property if the maximal length $m$ of an irredundant generating sequence for the group is 3. In addition, if $m=4$, the group satisfies the property for any prime $p$. In this paper, we will extend such classification for PSL$(2,q)$ where $q$ is $p$ and $p^2$ with conditions of modulo 8 and 10 on $p$.
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2019 1verdicts
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On the Replacement Property for PSL(2, p)
PSL(2,p) satisfies the replacement property exactly for p in {7,11,19,31} and p congruent to 3 or -3 modulo both 8 and 10; however, the proof of the failure cases contains a false construction.