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b. 8

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

..

We add a cautionary  before f2 after GE2 (→GE3GE4) and EE4.

category imprint: Differences between sources; Editorial revisions

issues: EE revisions , GE revisions

b. 10

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

..

In A there is no  returning a2 on the 10th semiquaver. This obvious oversight was corrected in FE (→GE,EE).

category imprint: Interpretations within context; Differences between sources

issues: Omissions to cancel alteration , Errors of A , Authentic corrections of FE

b. 11

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

..

In A Chopin overlooked the  raising c1 to con the 3rd quaver. The mistake was corrected in FE (→GE,EE). 

category imprint: Differences between sources

issues: Errors of A , Authentic corrections of FE

b. 12

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

e2 in A

e2 & e2 in FE (→GE,EE)

..

Lack of the  returning e2 on the 7th semiquaver and the  returning e2 two semiquavers later clearly suggests the use of the C minor chord in the middle of this bar. Chopin's proofreadings of FE (→GE,EE), however, ensure that, similarly as in bar 4, the composer's intention was the C major chord (in A analogous bar 37 is already written correctly).

category imprint: Interpretations within context; Differences between sources; Corrections & alterations

issues: Omissions to cancel alteration , Errors of A , Authentic corrections of FE

b. 13

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

..

In A there is no  lowering a1 to a1 in the L.H. and the  lowering e2 to eon the 9th semiquaver in the R.H. The comparison with 11 analogous bars proves Chopin's oversight. In FE (→GE,EE) the accidentals were added.

category imprint: Interpretations within context; Differences between sources

issues: Errors of A , Authentic corrections of FE