2 papers
math.GT2022
The level principal congruence subgroup of
Nao Imoto, Ryoma Kobayashi
The abelianization of the level principal congruence subgroup of was determined by Lee-Szczarba. By this result and a result of Tits, we ca…
math.GT2021
On squares of Dehn twists about non-separating curves of a non-orientable closed surface
Nao Imoto, Ryoma Kobayashi
The level mapping class group of an orientable closed surface can be generated by squares of Dehn twists about non-separating curves. On the other hand, the level mapping c…