Title: Tangent points of d-lower content regular sets and $β$ numbers,
Abstract: We present a generalisation of C. Bishop and P. Jones' result in [BJ1], where
they give a characterisation of the tangent points of a Jordan curve in terms
of $\beta$ numbers. Instead of the $L^\infty$ Jones' $\beta$ numbers, we use an
averaged version of them, firstly introduced by J. Azzam and R. Schul in [AS1].
A fundamental tool in the proof will be the Reifenberg parameterisation Theorem
of G. David and T. Toro (see [DT1]).