I tried to insert the "is incomparable to" (or "equal and parallel to") symbol
to my equation. So, I tried the solution supplied by Wikipedia (https://en.wikipedia.org/wiki/List_of_mathematical_symbols#cite_note-19). But I got a compiler error (missing $ inserted)
Any comment, suggestion is welcome Thanks in advance
\#or\text{\#}(with\usepackage{amsmath})? – Werner Jan 30 '18 at 21:11\equalparallel; see the Comprehensive LaTeX Symbol LIst (Table 103, p 57). – Werner Jan 31 '18 at 17:20