Absence of spectral values (q with multiple zeros of partial theta) proven in sector union disk radius 0.207875..., with one value at 0.309249... and zero-moduli separation by negative half-integer powers of |q|.
Sokal, The leading root of the partial theta function, Adv
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Where not to find the spectrum of the partial theta function
Absence of spectral values (q with multiple zeros of partial theta) proven in sector union disk radius 0.207875..., with one value at 0.309249... and zero-moduli separation by negative half-integer powers of |q|.