All complex conjugate zeros of θ(q,x) with Re(x)≥0 lie in 1<|x|<5 for q∈(0,1), none exist for q≤0.6687..., and those with Re(x)<0 lie in |x|<49.8.
The combinatorics of the leading root of the partial theta function
3 Pith papers cite this work. Polarity classification is still indexing.
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abstract
Recently Alan Sokal studied the leading root $x_0(q)$ of the partial theta function $\Theta_0(x,q)=\sum\limits_{n=0}^\infty x^nq^{\binom n2}$, considered as a formal power series. He proved that all the coefficients of $$-x_0(q)=1+q+2q^2+4q^3+9q^4+...$$ are positive integers. I give here an explicit combinatorial interpretation of these coefficients. More precisely, I show that $-x_0(q)$ enumerates rooted trees that are enriched by certain polyominoes, weighted according to their total area.
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UNVERDICTED 3representative citing papers
For the partial theta function θ(q,x), real zeros lie left of a vertical line Re x = -a (a≥5) while complex zeros lie right of it, with no real zeros ≥-6 for q>0 and similar bounds for q<0.
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|.
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On the location of the complex conjugate zeros of the partial theta function
All complex conjugate zeros of θ(q,x) with Re(x)≥0 lie in 1<|x|<5 for q∈(0,1), none exist for q≤0.6687..., and those with Re(x)<0 lie in |x|<49.8.
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Some analytic properties of the partial theta function
For the partial theta function θ(q,x), real zeros lie left of a vertical line Re x = -a (a≥5) while complex zeros lie right of it, with no real zeros ≥-6 for q>0 and similar bounds for q<0.
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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|.