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Verbal indications

b. 4

composition: Op. 10 No 4, Etude in C♯ minor

 in AI

No sign in FE (→GE,EE)

..

The hairpin in AI is an original marking, substituted by cresc. in bar 1 in the version intended for publication.

category imprint: Differences between sources

b. 7

composition: Op. 10 No 4, Etude in C♯ minor

in AI

No marking in FE (→GE,EE)

..

 in AI was almost certainly intentionally overlooked in the printed version.

category imprint: Differences between sources; Corrections & alterations

b. 8

composition: Op. 10 No 4, Etude in C♯ minor

No marking in AI

 in FE (→GE,EE)

 suggested by the editors

..

According to us, the  combination, very rarely used by Chopin, is most probably an inaccurately reproduced   mark, which was used by Chopin on a number of occasions (e.g., in the autograph of the Etude in E major, No. 11, bars 17-25). Cf. bar 1.

category imprint: Interpretations within context; Differences between sources; Editorial revisions

issues: Inaccuracies in FE

b. 11

composition: Op. 10 No 4, Etude in C♯ minor

in AI

No marking in FE (→GE,EE)

..

 in AI – together with in bar 12 – is certainly an element of the original concept of dynamic indications of the Etude.

category imprint: Differences between sources

b. 12

composition: Op. 10 No 4, Etude in C♯ minor

 in AI, literal reading

 in AI, contextual interpretation

 in FE (→GE,EE2)

, possible interpretation of FE (→GE,EE2)

 in FE (→GE,EE2), probable interpretation

 &  in EE3 (→EE4)

..

The  mark in AI is clearly valid from the beginning of the bar. In turn,  in FE (→GE,EE2), apart from the literal reading, can be interpreted in several ways, e.g., as  valid in this place or – which is more plausible – as  valid from the beginning of the bar. In the main text we propose the latter, being the resultant of both source notations (Cf. also analogous bar 62).
In EE3 (→EE4) an arbitrary  was added to  adopted from FE (near the end of the bar), probably on the basis of comparison with bar 62.  

category imprint: Interpretations within context; Differences between sources; Editorial revisions

issues: EE revisions , Centrally placed marks