A spinor field is defined to be a section of the spinor bundle S, i.e., a smooth mapping such that is the identity mapping idM of M.
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“Is not the tremendous strength in men of the impulse to creative work in every field precisely due to their feeling of playing a relatively small part in the creation of living beings, which constantly impels them to an overcompensation in achievement?”
—Karen Horney (1885–1952)