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An eye chart for the mathematically inclined, with imaginary numbers of the form iy, complex numbers of the form x + iy, and math symbols on display, instead of showing any of the 26 letters of the English alphabet and the ten numerals zero to nine.
At some prestigious universities, when undergoing a medical check-up, math students are given the choice between an i chart and the eye chart that is conventionally used in spectacles shops, clinics, and hospitals.
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by MathPlus April 23, 2018
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