Issues : 4/4 or 2/2

b. 1

composition: Op. 25 No 10, Etude in B minor

in GC, EE & GE2 (→GE3)

in FE & GE1

..

The use of the  time signature is surprising only in GE1, as FE did not use the  indication in the Etudes – contrary to the manuscripts – even once, neither in Op. 25 nor in Op. 10 and in the Etude in F minor, Dbop. 36 No. 1 (cf. also the Impromptu in A major, Op. 29). Anyways, the correctness and authenticity of the  time signature is undeniable with respect to the compatible version of GC and EE.
The correct time signature returned in GE2 (→GE3).
Similarly in bar 104. 

category imprint: Differences between sources

issues: Changes of metre , Inaccuracies in GE , Inaccuracies in FE , GE revisions , 4/4 or 2/2

b. 1

composition: Op. 25 No 12, Etude in C minor

in FC, EE & GE2 (→GE3)

in FE & GE1

..

The use of  time signature surprises only in GE1, as in FE the  indication was not used in the Etudes – contrary to the manuscripts – at all, neither in Op. 25 nor in Op. 10 and the Etude in F minor, Dbop. 36 No. 1 (cf. also the Impromptu in A major, Op. 29). In any case, the correctness and authenticity of the  time signature is unquestionable due to the compatible version of FC and EE. The correct time signature was returned in GE2 (→GE3). 

category imprint: Differences between sources

issues: Changes of metre , Inaccuracies in GE , Inaccuracies in FE , GE revisions , 4/4 or 2/2

b. 1

composition: Op. 25 No 11, Etude in A minor

in GC, EE & GE2 (→GE3)

in FE & GE1

..

The use of the  time signature surprises only in GE1, as in FE the  indication was not used in the Etudes – contrary to the manuscripts – at all, both in Op. 25 and in Op. 10 and the Etude in F minor, Dbop. 36 No. 1 (cf. also the Impromptu in A major, Op. 29). In any case, the correctness and authenticity of the  time signature is undeniable towards the compatible version of GC and EE. The correct time signature was returned in GE2 (→GE3).

category imprint: Differences between sources

issues: Changes of metre , Inaccuracies in GE , Inaccuracies in FE , GE revisions , 4/4 or 2/2

b. 1

composition: Op. 35, Sonata in B♭ minor, Mvt I

in GC (→GE) & EE2

in FE (→EE1)

..

The  time signature in FE (→EE1) is almost certainly a result of inattention or manner of the engravers of FE, who in numerous pieces by Chopin seemed not to differentiate between  and  – see the Etudes, Op. 10 or the Impromptu in A major, Op. 29. Therefore, in the main text we give , written in GC (→GE), whose correctness and authenticity do not raise any doubts. This time signature – probably under the influence of GE – was introduced also in EE2.    

category imprint: Differences between sources

issues: EE revisions , Errors in FE , 4/4 or 2/2

b. 1

composition: Op. 21, Concerto in F minor, Mvt I

in A

in GE (→FEEE)

..

Change of the time signature from  to  is one of the most characteristic inaccuracies of first editions of Chopin's works – see e.g. the Sonata in B minor, Op. 35, 1st mov., bar 1.

category imprint: Differences between sources

issues: Errors in GE , 4/4 or 2/2 , Errors repeated in FE , Errors repeated in EE