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b. 17-18

composition: Op. 10 No 5, Etude in G♭ major

..

The missing naturals raising c1 to c1 in A are a patent error by Chopin.

category imprint: Interpretations within context; Differences between sources

issues: Omission of current key accidentals , Errors of A , Authentic corrections of FE , Last key signature sign

b. 22

composition: Op. 10 No 5, Etude in G♭ major

Triad in A

Third in FE (→GE,EE)

..

Chopin removed a1 from the chord on the 3rd quaver in the bar in a proofreading of FE (→GE,EE).

category imprint: Differences between sources; Corrections & alterations

issues: Authentic corrections of FE

b. 23

composition: Op. 10 No 5, Etude in G♭ major

..

Lack of the natural raising c to c in A is Chopin's patent oversight.

category imprint: Interpretations within context; Differences between sources

issues: Omission of current key accidentals , Errors of A , Authentic corrections of FE

b. 24

composition: Op. 10 No 5, Etude in G♭ major

e3 in A (→FEGE,EE)

g3 in FES

..

According to us, the change of e3 to g3 written by Chopin in FES is a correction of the error of A and the remaining sources. Locally, the version with e3 – in bars 23-24 – is perfectly correct, yet in combination with the following bar, the note does not find a natural continuation (to d3), and, what is more important, it significantly weakens the effect of the constant g3 note, being an axis of the combination of chords in bars 24 and 25. In addition, Chopin's fingering in this place suggests a more significant distance than a fifth.  

category imprint: Interpretations within context; Differences between sources

issues: Terzverschreibung error , Errors in the number of ledger lines , Errors of A

b. 24

composition: Op. 10 No 5, Etude in G♭ major

..

In A (→EE,GE1GE2GE3) there is an unnecessarily repeated  before the upper note of the octave at the end of the bar.

category imprint: Source & stylistic information