The left hand should omit them, but be careful to omit only those that are really duplicates. There are a few places toward the end of each section where the left-hand notes differ from those in the right. In those cases you must be careful to play all the notes that are written.
[BACH]
The Beginner in Bach Music
Can you give me a few helpful suggestions in a preliminary study of Bach?
A totality consists of many parts. If you cannot master the totality of a work by Bach try each part by itself. Take one part of the right hand, one part of the left, add a third part, and so on until you have all the parts together. But be sure to follow out the line of each separate part (or "voice," as the Continentals say). Do not lose patience. Remember that Rome was not built in a day.
Bach's Music Necessary to Good Technique
Do you think the study of Bach is necessary to the development of one's technique, or should one let his music alone until a later day when one's technique is in good condition? Some of his music seems so dry.
Bach's music is not the only music that develops the technique. There is, for instance, the music of Czerny and Clementi to be considered. But Bach's music is particularly qualified to develop the fingers in conjunction with musical expression and thematic characterization. You may start with Czerny and Clementi, but you ought soon to turn to Bach. That some of his music seems dry to you may be due to your mental attitude by which you possibly expect from ecclesiastical music what only the opera can give you. Think yourself into his style and you will find a mine of never-dreamed-of enjoyment.
Always Keep in Touch with Bach
Do you think that the playing of Bach's works will keep one's hands in good technical condition? And which is the best edition of Bach's piano works?