Throughout the notebook we ignore normalisations as well as signs of quantities (freely picking amplitudes or 1 or slopes of 1 regardless of the situation for our NDSolve symmetry conditions).
In particular, even if we were to normalise, we'd still have solutions for the normalisation that would be of the form . Why are we free to ignore the signs?

Question

Throughout the notebook we ignore normalisations as well as signs of quantities (freely picking amplitudes or 1 or slopes of 1 regardless of the situation for our NDSolve symmetry conditions).  
 In particular, even if we were to normalise, we'd still have solutions for the normalisation that would be of the form   . Why are we free to ignore the signs?

Accepted Answer

because positive and negative are the same and differ only in phase

Answer

because positive and negative are completely the same

Answer

because we are working in a positive potential we only keep positive normalisations

Answer

because we cannot have negative energy, we ignore negative normalisations.

Crowdly

Throughout the notebook we ignore normalisations as well as signs of quantities ...

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