We have left out very little that is in the notebooks: the omissions almost always were of sketches of symbolism, which could not be interpreted or were otherwise uninteresting. Wittgenstein's use of symbols in logical formulae is often experimental, nor does he always stick to one rule, e.g. In the use of dots. We did not want, however, to interfere with it systematically. In a few places we have corrected evident slips of the pen or slightly amended a formula so as to make its intended meaning more obvious.

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