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Coefficient expansions
a₂…a₅ as polynomials in Schur parameters
Counterexamples
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Rational 25
Koebe z/(1-z)² z/(1-z)^2 1 proven 1 · 8
Koebe Kα: z/(1-z)^(2α) z/(1-z)^(2*alpha) 16 disproven parametric (1) 16 · 25
z(1-z/2)/(1-z)^2 z*(1 - z/2)/(1-z)**2 1 disproven 1 · 1
z(1-z/3)/(1-z)^2 z*(1 - z/3)/(1-z)**2 1 disproven 1 · 1
z(1+z/2)/(1-z) z*(1 + z/2)/(1 - z) 1 disproven 1 · 1
z(1+z)/(1-z) z*(1 + z)/(1 - z) 1 disproven 1 · 1
(z - z^2/2)/(1-z)^2 (z - z**2/2)/(1-z)**2 1 disproven 1 · 1
z/(1-z) z/(1-z) 1 proven 1 · 8
z/(1-z/2) z/(1 - z/2) 1 proven 1 · 8
z/(1-z/2)² z/(1 - z/2)^2 1 proven 1 · 8
z/(1-z/3) z/(1 - z/3) 1 proven 1 · 8
z/(1-z/4) z/(1 - z/4) 1 proven 1 · 1
z/(1-z)^4 z/(1-z)**4 1 disproven 1 · 1
z/(1-z/5) z/(1 - z/5) 1 proven 1 · 1
z/(1-z)^3 z/(1-z)**3 1 disproven 1 · 1
z/(1-z+z^2/2) z/(1 - z + z**2/2) 1 proven 1 · 1
z/(1-z+z^2) z/(1-z+z**2) 1 proven 1 · 1
z/(1-z^2) z/(1-z**2) 1 proven 1 · 1
z/(1+z/2) z/(1 + z/2) 1 proven 1 · 1
z/(1+z/3) z/(1 + z/3) 1 proven 1 · 1
z/(1+z) z/(1+z) 1 proven 1 · 8
z/(1+z²) z/(1+z^2) 1 proven 1 · 8
z/(1+z)^3 z/(1+z)**3 1 disproven 1 · 1
z/(1+z+z^2) z/(1+z+z**2) 1 proven 1 · 1
z/(1+z)^2 z/(1+z)**2 1 proven 1 · 1
Ma-Minda 24
Polynomial 24
Silverman polynomial test - 1 proven 1 disproven parametric (1) 2 · 8
z + 3z² (truly disproven) z + 3*z**2 1 disproven 1 · 5
z + 3z³ (boundary test) z + 3*z**3 1 proven 1 · 5
z − z²/4 - 1 proven 1 · 4
z + z²/2 - 1 proven 1 · 4
z + z²/4 - 1 proven 1 · 4
z + z²/4 + z³/9 - 1 proven 1 · 4
z + z² + z³ - 1 disproven 1 · 4
z + z³/3 - 1 proven 1 · 4
z - z^2/2 z - z**2/2 1 proven 1 · 1
z - z^2/2 + z^3/3 z - z**2/2 + z**3/3 1 disproven 1 · 1
z - z^2/4 z - z**2/4 1 proven 1 · 1
z - z^3/3 z - z**3/3 1 proven 1 · 1
z + z^2/5 z + z**2/5 1 proven 1 · 1
z + z^5/5 z + z**5/5 1 proven 1 · 1
z + z^2/2 z + z**2/2 1 proven 1 · 1
z + z^2/2 + z^3/3 z + z**2/2 + z**3/3 1 disproven 1 · 1
z + z^2/4 + z^3/9 z + z**2/4 + z**3/9 1 proven 1 · 1
z + z^3/4 z + z**3/4 1 proven 1 · 1
z + z^4/4 z + z**4/4 1 proven 1 · 1
z + z^2/6 z + z**2/6 1 proven 1 · 1
z + z^2/3 z + z**2/3 1 proven 1 · 1
z + z^3/3 z + z**3/3 1 proven 1 · 1
z + z²/4 (C01 boundary) z + z**2/4 1 proven 1 · 5
Exponential 21
(e^(2z)-1)/2 (exp(2*z) - 1)/2 1 proven 1 · 1
(e^(3z)-1)/3 (exp(3*z) - 1)/3 1 disproven 1 · 1
z cosh(z) z*cosh(z) 1 disproven 1 · 8
z·exp(2z) — convex of order 1/2 z*exp(2*z) 1 disproven 1 · 5
z e^(-z^2/2) z*exp(-z**2/2) 1 proven 1 · 1
z e^(-z^2/3) z*exp(-z**2/3) 1 proven 1 · 1
z e^(-z/2) z*exp(-z/2) 1 proven 1 · 1
z e^(-z/3) z*exp(-z/3) 1 proven 1 · 1
z e^(-z) z*exp(-z) 1 proven 1 · 8
z e^z z*exp(z) 1 proven 1 · 8
z e^(z²) z*exp(z/2) 1 proven 1 · 8
z·exp(z²/3) (queue test) z*exp(z**2/3) 1 proven 1 · 1
z e^(z^2/2) z*exp(z**2/2) 1 proven 1 · 1
z e^(z^2/4) z*exp(z**2/4) 1 proven 1 · 1
z e^(z^2/6) z*exp(z**2/6) 1 proven 1 · 1
z·exp(z³/3) z*exp(z**3/3) 1 proven 1 · 5
z·exp(z⁴/4) (queue test) z*exp(z**4/4) 1 proven 1 · 1
z·exp(z/2) — half exponential z*exp(z/2) 1 proven 1 · 5
z e^(z/3) z*exp(z/3) 1 proven 1 · 1
z e^(z/4) z*exp(z/4) 1 proven 1 · 1
sinh(z) (normalized) sinh(z) 1 proven 1 · 8
Trigonometric 12
arctanh(z) atanh(z) 1 proven 1 · 8
sin(z) sin(z) 1 proven 1 · 8
tan(z) tan(z) 1 proven 1 · 1
3 sin(z/3) 3*sin(z/3) 1 proven 1 · 1
2 sin(z/2) 2*sin(z/2) 1 proven 1 · 1
2 tan(z/2) 2*tan(z/2) 1 proven 1 · 1
arctan(z) (normalized) atan(z) 1 proven 1 · 5
z cos(z) z*cos(z) 1 disproven 1 · 8
z cos(z/2) z*cos(z/2) 1 proven 1 · 1
z cos(z/3) z*cos(z/3) 1 proven 1 · 1
z sec(z) z/cos(z) 1 proven 1 · 1
z sec(z/2) z/cos(z/2) 1 proven 1 · 1
Test Function 8
Alternating signs Σ(-1)^(n-1)/n z^n - 1 disproven 1 · 4
C01 boundary 3-term - 1 proven 1 · 4
C01 exact boundary - 1 proven 1 · 4
C01 just over - 1 proven 1 · 4
de Branges boundary, a₂=2 - 1 disproven 1 · 4
Fast decay Σ 1/4^n z^n - 1 proven 1 · 4
Large a₃ test - 1 disproven 1 · 4
Slow decay Σ 1/n z^n - 1 disproven 1 · 4
Hyperbolic 7
tanh(z) tanh(z) 1 proven 1 · 1
3 sinh(z/3) 3*sinh(z/3) 1 proven 1 · 1
3 tanh(z/3) 3*tanh(z/3) 1 proven 1 · 1
2 tanh(z/2) 2*tanh(z/2) 1 proven 1 · 1
z cosh(z/2) z*cosh(z/2) 1 proven 1 · 1
z cosh(z/3) z*cosh(z/3) 1 proven 1 · 1
z sech(z) z/cosh(z) 1 proven 1 · 1
Bi-Univalent 3
Bi-univalent test: a₂=0.5, a₃=0.3 - 1 proven 1 · 4
Bi-univalent test: a₂=1, a₃=1 - 1 disproven 1 · 4
Bi-univalent √2 extremal - 1 disproven 1 · 4
Close-to-Convex 3
z + 2z² z + 2z^2 1 disproven 1 · 4
z + z² z + z^2 1 disproven 1 · 8
z + z² + z³/2 z + z^2 + z^3/2 1 disproven 1 · 8
Bessel 2
Modified Bessel I_ν - 17 proven 2 disproven applied parametric (1) 19 · 25
Normalized Bessel J_ν - 27 proven 4 disproven applied parametric (1) 33 · 66
Elementary 2
Identity z z 1 proven 1 · 8
−log(1−z) -log(1-z) 1 proven 1 · 8
Fractional 2
Miller-Ross family demo (z·E_{1,2}(z)) z*(exp(z)-1)/z + z*0 1 proven applied 1 · 1
Rabotnov-family demo (z + z²/2 + z³/6) z + z**2/2 + z**3/6 1 proven applied 1 · 1
Hypergeometric 2
₂F₁(a, b; c; z) — Gauss hypergeometric - 9 proven 4 disproven applied parametric (3) 13 · 22
₁F₁(a; c; z) — Kummer confluent hypergeometric - 19 proven 2 disproven applied parametric (2) 21 · 36
Logarithmic 2
log(1+z) log(1 + z) 1 proven 1 · 1
-2 log(1-z/2) -2*log(1 - z/2) 1 proven 1 · 1
Mittag-Leffler 2
Mittag-Leffler E_α - 26 proven 13 disproven applied parametric (1) 38 · 78
Two-parameter Mittag-Leffler E_{a,b} - 29 proven 7 disproven parametric (0) 36 · 36
Convex Order 1
Convex of order α — K(α) - 11 proven 14 disproven parametric (1) 25 · 40
Cusp Domain 1
Cusp-domain family demo (z + z²/4 - z³/8) z + z**2/4 - z**3/8 1 proven applied 1 · 1
Error Function 1
erf(z) normalized - 1 proven 1 · 4
Janowski 1
Janowski S*[A,B] extremal - 8 proven 10 disproven applied parametric (2) 20 · 38
Laguerre 1
Laguerre L_n - 1 proven 6 disproven parametric (1) 10 · 19
Lommel 1
Lommel s_{μ,ν}(z) normalized (ν=1/2) - 14 disproven applied parametric (1) 14 · 23
Mocanu 1
Mocanu α-convex - 14 proven 7 disproven applied parametric (1) 21 · 30
Ruscheweyh 1
Ruscheweyh family R(λ) - 23 disproven applied parametric (1) 23 · 35
Strongly Starlike 1
Strongly starlike SS*(β) - 10 proven 10 disproven parametric (1) 20 · 35
Struve 1
Struve H_ν (normalized) - 11 proven applied parametric (1) 16 · 34
Wright 1
Wright φ(α,β; z) - 18 proven 27 disproven applied parametric (2) 45 · 60
q-Series 1
q-exponential e_q(z) - 31 proven 7 disproven parametric (1) 38 · 71
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