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/usr/share/X11/locale/en_US.UTF-8/Compose (Ubuntu 18.04) defines compose sequences for accented variations of the turned "e" character:

<dead_acute> <U018E>                    : "Ǝ́"   # LATIN CAPITAL LETTER TURNED E WITH ACUTE
<dead_grave> <U018E>                    : "Ǝ̀"   # LATIN CAPITAL LETTER TURNED E WITH GRAVE
<dead_circumflex> <U018E>               : "Ǝ̂"   # LATIN CAPITAL LETTER TURNED E WITH CIRCUMFLEX
<dead_caron> <U018E>                    : "Ǝ̌"   # LATIN CAPITAL LETTER TURNED E WITH CARON
<dead_macron> <U018E>                   : "Ǝ̄"   # LATIN CAPITAL LETTER TURNED E WITH MACRON
<dead_tilde> <U018E>                    : "Ǝ̃"   # LATIN CAPITAL LETTER TURNED E WITH TILDE
<dead_acute> <dead_tilde> <U018E>       : "Ǝ̃́"   # LATIN CAPITAL LETTER TURNED E WITH TILDE AND ACUTE
<dead_grave> <dead_tilde> <U018E>       : "Ǝ̃̀"   # LATIN CAPITAL LETTER TURNED E WITH TILDE AND GRAVE

<dead_acute> <U01DD>                    : "ǝ́"   # LATIN SMALL LETTER TURNED E WITH ACUTE
<dead_grave> <U01DD>                    : "ǝ̀"   # LATIN SMALL LETTER TURNED E WITH GRAVE
<dead_circumflex> <U01DD>               : "ǝ̂"   # LATIN SMALL LETTER TURNED E WITH CIRCUMFLEX
<dead_caron> <U01DD>                    : "ǝ̌"   # LATIN SMALL LETTER TURNED E WITH CARON
<dead_macron> <U01DD>                   : "ǝ̄"   # LATIN SMALL LETTER TURNED E WITH MACRON
<dead_tilde> <U01DD>                    : "ǝ̃"   # LATIN SMALL LETTER TURNED E WITH TILDE
<dead_acute> <dead_tilde> <U01DD>       : "ǝ̃́"   # LATIN SMALL LETTER TURNED E WITH TILDE AND ACUTE
<dead_grave> <dead_tilde> <U01DD>       : "ǝ̃̀"   # LATIN SMALL LETTER TURNED E WITH TILDE AND GRAVE

but strangely, it doesn't define a sequence for the character itself.

It doesn't even define the similar characters (U+2203 ∃ "there exists") and (U+0259 ə "schwa").

Is there some sequence for these characters (Ǝ U+018E, and ǝ U+01DD), or do I have to define it myself in my ~/.XCompose file?

And if not, why aren't they defined along with the accented versions?

  • should there be any deep reason for that? ə is defined as multi_key+e+e on my system (Debian Buster). Another 5 releases from now, and you will have the whole set ;-) – Uncle Billy Apr 7 at 3:02
  • @UncleBilly, it just seems very strange to go to the trouble of providing a character with both a tilde and a grave accent at the same time, but not the unaccented character itself. Which one are people going to need more frequently? – Ray Butterworth Apr 7 at 3:08
  • They probably generated that automatically. – Uncle Billy Apr 7 at 3:09
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    Doesn't shift-ctrl-u 18e<enter> work for you? Repeating e generates an ə in compose. – Isaac Apr 7 at 4:51
  • @Isaac, yes, but that's only a work-around. Why would compose sequences be provided for almost never used variations of a character, but not the original character itself? – Ray Butterworth Apr 7 at 12:54

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