Last modified: 2014-11-10 22:34:16 UTC
Created attachment 17077 [details] correct image https://meta.wikimedia.org/wiki/Help:Displaying_a_formula#Fractions.2C_matrices.2C_multilines https://en.wikipedia.org/wiki/Help:Displaying_a_formula#Fractions.2C_matrices.2C_multilines Arrays: {|c|c||c|} where || - 2lines it's in Wikipedia if the settings "PNG images" but if there "MathML with SVG or PNG" then || shown as a single line
Created attachment 17078 [details] incorrect image
This is actually a limitation of the MathML spec that only allows solid and dashed table lines (not double lines).