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b.

composition: (Op. 4), Sonata in C minor, Mvt II

category imprint:

b. 1

composition: (Op. 4), Sonata in C minor, Mvt II

= 60 in A (→GEFE)

= 80 in EE

No marking in IE

..

The higher value in the metronome marking is most probably due to a mistake by the EE1 engraver. Similarly, we consider the absence of the entire marking in IE to be an oversight.

category imprint: Differences between sources

issues: Errors in FE , Errors in EE

b. 1

composition: (Op. 4), Sonata in C minor, Mvt II

 in bar 1 in A

 in GE (→FE,EE,IE)

..

In the main text we keep the Chopinesque A notation, in which , although slightly closer to the bottom stave, probably refers to the parts of both hands. The clarification in GE (→FE,EE,IE), certainly compliant with the performance resulting from the A text, can be considered rational and regarded as a practical variant, drawing our attention to the quasi-canon-like dialogue between the hands.
As far as the position of the mark is concerned, either in the upbeat or at the beginning of bar 1, both can be found in Chopin's pieces (cf., e.g. the Etude in A, Op. 25 No. 1 and in A minor, Op. 25 No. 4), sometimes even within the same piece, e.g. in the Mazurka in C minor, Op. 30 No. 1. Although it is difficult to guess what Chopin's motivation was when choosing one of the versions, it does not seem essentially important, practically speaking.

category imprint: Differences between sources

issues: GE revisions

b. 1

composition: (Op. 4), Sonata in C minor, Mvt II

No slur in sources

Slur suggested by the editors

..

It is difficult to assume that Chopin would have wanted to mark the L.H. motifs in bar 1 and 3 differently, hence we consider the absence of the slur in bar 1 to be Chopin's inadvertence.

category imprint: Editorial revisions

b. 2-4

composition: (Op. 4), Sonata in C minor, Mvt II

Slurs to b in A

Slurs to c1 in GE (→FE,EE,IE)

..

The shorter R.H. slurs in bar 2 and 4 resulted from arbitrary decisions by the GE engraver (→FE,EE,IE), who standardised the slurs concerning the left- and right-hand motifs, which seems justified. However, the A notation is exceptionally precise and consistent, hence we keep it in the main text, although in this context both versions indicate the same performance, according to us.
See also bar 11. 

category imprint: Differences between sources

issues: GE revisions