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b. 13-14

composition: Op. 10 No 2, Etude in A minor

No signs in CLI & FE (→GE,EE

  in Ap

..

The   pair of the signs in Ap may be considered as an addition to the dynamic markings in FE (→GE,EE) in bars 9-10 and 15.

category imprint: Differences between sources

b. 13

composition: Op. 10 No 2, Etude in A minor

..

In the main text we do not consider the cautionary  before the 3rd semiquaver b1. The sign is present in all first editions.

category imprint: Differences between sources; Editorial revisions

issues: Cautionary accidentals

b. 15-18

composition: Op. 10 No 2, Etude in A minor

No fingering in Ap

Fingering in FE (→GE,EE

..

In the main text we give the fingering written by Chopin in FEcor.

category imprint: Differences between sources

issues: Authentic corrections of FE

b. 15

composition: Op. 10 No 2, Etude in A minor

..

In CLI there is no  lowering b to b on the 2nd beat of the bar nor the  returning before the last chord. These are patent errors, being probably a result of the copyist's distraction.

category imprint: Interpretations within context; Differences between sources

issues: Errors of CLI

b. 15

composition: Op. 10 No 2, Etude in A minor

..

In CLI and FEcor there is no  returning d3 on the 3rd beat of the bar. Chopin corrected his oversight in one of later proofreadings of FE (→GE,EE). 

category imprint: Interpretations within context; Differences between sources

issues: Omissions to cancel alteration , Errors of CLI