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b. 78

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

Octaves in A

Single D in FE (→GE,EE)

..

It is uncertain whether the octaves, written in A in an abbreviated form with the use of 8, were not simply overlooked in FE (→GE,EE). Stylistically, both versions seem to be equal. In the main text we give the version of the editions, as Chopin could have considered it as the correct one even if it had emerged accidentally (there are no entries in this place in any of the pupils' copies).

category imprint: Differences between sources

issues: Errors in FE , Authentic corrections of FE , Bass register changes , Abbreviated octaves' notation

b. 78

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

in A (→FEEE,GE1GE2)

No marking in GE3 (→GE4GE5)

..

Lack of  in GE3 and subsequent is most probably a mistake.

category imprint: Differences between sources

issues: Errors in GE

b. 79

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

No fingering in A (→FEGE)

Fingering in EE

..

In EE Fontana added the fingering for the first two figures, beginning from thirds.

category imprint: Differences between sources

issues: EE revisions

b. 79-80

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

No marks in A

Accents in FE (→GE,EE)

..

All articulation indications and accents in bars 79-84 were added by Chopin in a proofreading of FE (→EE). However, the attention is drawn by the fact that the slurs were introduced in the entire four-bar section, yet the accents appear only in bars 79-80. It is unclear whether it is a result of distraction (Chopin's or the engraver's) or a conscious decision of the composer, which, after all, does not have to indicate a change in the performance manner, as the accents in bars 79-80 may be interpreted as a model valid until the end of bar 82. 

category imprint: Differences between sources

issues: Authentic corrections of FE

b. 79-82

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

No slurs in A

Slurs in FE (→GE,EE)

..

All slurs were added by Chopin in a proofreading of FE (→GE,EE).

category imprint: Differences between sources

issues: Authentic corrections of FE