In EE, this four-bar section is provided only with 
signs. The absence of 
signs in bars 38 and 40 cannot be, however, considered as a mistake, as Chopin, in a similar way – with a pair of signs – marked analogous bars 17-20. Therefore, it cannot be excluded that in bars 37-40 it is exactly the version of EE that corresponds to the final intention of Chopin. As the sources do not give basis for a clear conclusion, in the main text we suggest signs in brackets, leaving their consideration at the discretion of performers.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Scope of dynamic hairpins
notation: Articulation, Accents, Hairpins