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by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
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Simplify: -potentially confusing to type "q_i" for coord surfaces since this could suggest they change instead of remaining constant, -else ambiguous and clutter, -also not much is gained by drawing multiple surfaces as this is illustrated
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On second thought it may be better to keep the coord curves and surfaces together which would indicate constancy of one coordinate value for each surface...
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This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.
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Recolour and redraw for clarity, to save ink (if printed), and parallel a simalar diagram in the WP article.
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Redraw: make lines consistent thickness, draw cobasis with surfaces.
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