Title: On zeros of polynomials in best $L^p$-approximation and inserting mass points,
Abstract: The purpose of this note is to revive in $L^p$ spaces the original A. Markov
ideas to study monotonicity of zeros of orthogonal polynomials. This allows us
to prove and improve in a simple and unified way our previous result [Electron.
Trans. Numer. Anal., 44 (2015), pp. 271-280] concerning the discrete version of
A. Markov's theorem on monotonicity of zeros.