In LaTeX, the spaces \, and \thinspace are 1/6 em = 3/18 em wide. Right now, they're translated to a unicode THIN SPACE (0.2em = 3.6/18 em or sometimes 1/6 em = 3/18 em). A faithful representation would be the unicode SIX-PER-EM SPACE (1/6 em always).
In LaTeX, the spaces \:, \>, and \medspace are .2222 em = 4/18 em wide. Right now, they're translated to a unicode FOUR-PER-EM SPACE (0.25 em = 4.5/18 em). A faithful representation would be the unicode MEDIUM MATHEMATICAL SPACE (4/18 em).
In LaTeX, the \; space is .2777 em = 5/18 em wide. Right now, it's translated to a uncode THREE-PER-EM SPACE (0.333 em = 6/18 em). A slightly more faithful translation would be the unicode FOUR-PER-EM SPACE (0.25 em = 4.5/18 em).
Not sure what role semantics play in the translation choice ("A thin space is a thin space!"), but I thought I'd mention it here.
In LaTeX, the spaces
\,and\thinspaceare 1/6 em = 3/18 em wide. Right now, they're translated to a unicodeTHIN SPACE(0.2em = 3.6/18 em or sometimes 1/6 em = 3/18 em). A faithful representation would be the unicodeSIX-PER-EM SPACE(1/6 em always).In LaTeX, the spaces
\:,\>, and\medspaceare .2222 em = 4/18 em wide. Right now, they're translated to a unicodeFOUR-PER-EM SPACE(0.25 em = 4.5/18 em). A faithful representation would be the unicodeMEDIUM MATHEMATICAL SPACE(4/18 em).In LaTeX, the
\;space is .2777 em = 5/18 em wide. Right now, it's translated to a uncodeTHREE-PER-EM SPACE(0.333 em = 6/18 em). A slightly more faithful translation would be the unicodeFOUR-PER-EM SPACE(0.25 em = 4.5/18 em).Not sure what role semantics play in the translation choice ("A thin space is a thin space!"), but I thought I'd mention it here.