
Keywords: primary; 37F20; secondary; 26A03; 03E75; 03E17; Dense families; Selection principles; Sfin(O,O); Hurewicz property; Menger property; S1(O,O); Câ³; Rothberger property; Sfin(D,D); Sfin(D,D); Sfin(D,D); M-separable; Selectively separable; SS; S1(D,D); S1(D