  In recent years, some degenerate versions of quite a few special numbers and
polynomials are introduced and investigated by means of various methods. The
aim of this paper is to study some results on degenerate harmonic numbers,
degenerate hyperharmonic numbers, degenerate Fubi polynomials and degenerate
r-Fubini polynomials from a general identity which is valid for any two formal
power series and involves the degenerate r-Stirling numbers of the second kind.
