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The real part of the complementary error function
Yossi Lonke · 2021-01-15 · via math.PR updates on arXiv.org

It is shown that the real part of the complementary error function is bounded below by 1 in the subset of the complex plane where the principal argument is between $3π/4$ and $5π/4$. This improves a previous result asserting that the complementary error function has no zeros in the same set, whose proof was essentially based on calculus of two variables. The present proof uses an almost $60$ years old, relatively unknown estimate for the error function, combined with some elementary complex analysis, thus serving as a humble illustration to a quote attributed to Jacques Hadamard: "The shortest path between two truths in the real domain passes through the complex domain".

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