rasthedestroyer100 comments on Righting a Wrong Question - Less Wrong
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"For example, presumably light of different colors is identical to light of different wavelengths."
More specifically, lights of identical wavelengths have identical colors, and vice-versa. Clearly, "waves = colors" is not a valid statement of equality ('color' is an epiphenomenon of wavelengths arising as a percept in a sensory being, while the wavelengths the mind converts into colors exists independently of any observers). A wave is a wave, and a color is a color, and these two properties have a direct relationship upon which the equality or inequality of these properties in some group of objects can be ascertained.