No. See p163, TUS.
A font may contain a dotless-j glyph internally, just as the font may contain any other common shapes that it composes into other glyphs.
Andreas Prilop wrote:
> On 2000-04-05 16:13 +0200, John Cowan wrote:
> >As far as anybody knows, it is just a glyph; nobody uses it as a character.
> >I would guess that it got there from AMS (American Math. Soc.) which
> >derived it from its presence in TeX, where it is provided as a glyph.
> You need a dotless 'j' if you want to combine it with a circumflex
> (Esperanto) or with a hacek (ISO transliteration of Cyrillic) or
> with an arrow (vector).
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