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b. 1-2

composition: Op. 10 No 7, Etude in C major

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In A (→FEEE,GE1GE2) there are naturals before the upper notes on the last semiquaver of each group (b1). The unjustified accidentals were removed in GE3 (→GE4). Cf. bars 4 and 12, as well as 37-39.

category imprint: Differences between sources

issues: GE revisions , Cautionary accidentals , Last key signature sign

b. 2

composition: Op. 10 No 7, Etude in C major

Slur in A & EE

No slur in FE (→GE)

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In FE (→GE) the slur over the part of the R.H. was omitted. The sign was added in EE.

category imprint: Differences between sources

issues: EE revisions , Errors in FE

b. 2-3

composition: Op. 10 No 7, Etude in C major

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Initially, the slur of A in bar 2 ended on the last note in this bar (same as in bar 1). Chopin, while adding the slur in bar 3, ensured that it is added to the previous one, which can be considered as a template for all similar situations.

category imprint: Corrections & alterations

issues: Corrections in A

b. 3

composition: Op. 10 No 7, Etude in C major

f1-g1 in A

f1-b1 in FE (→GE,EE)

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The  f1-g1 second in A is most probably the original version of the 3rd semiquaver. In analogous bar 36 Chopin changed it to an f1-bfourth already in A. The traces of corrections are also visible in bar 3, yet the  f1-athird was removed, probably written by mistake. In bar 11, in which the 1st phrase appears one octave higher, the f2-b2 fourth is immediately written in A

category imprint: Differences between sources; Corrections & alterations

issues: Corrections in A , Authentic corrections of FE

b. 3

composition: Op. 10 No 7, Etude in C major

c repeated in A

c tied in FE (→GE,EE)

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The tie sustaining c was added in a proofreading of FE (→GE,EE), undoubtedly by Chopin (he introduced an identical addition in analogous bar 36).

category imprint: Differences between sources

issues: Authentic corrections of FE