There are three ways to understand your proposition.

1. White and purple are colors, by definition.

2.  Consider that blue = a, red = b, purple = c, yellow = d and white = e.

Then a = b, and c = d. e has no equivalent.

Purple is equivalent to the yellow color, and white has no equivalent color in this situation.

So the color of white is white (no equivalent), and the color of purple can also be equivalent to yellow.

3.  If white is blue and purple is yellow, combining the colors would result in a mixture of blue and yellow. When you mix blue and yellow, you get green. So, in this scenario, the combination of white and purple would be green.
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