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This function is certified starlike - the sharp, proven-exact coefficient bounds for the starlike class apply to it. See the certified proofs →
Canonical Key
poly_silverman
Parameter Space
variant{1,2} (discrete)

Image domain \(f(\mathbb{D})\)

The image of the unit disk under \(f\): concentric circles \(|z|=r\) and radial spokes mapped through \(f(z)=z+a_2z^2+\dots\); the bold curve is the boundary \(f(e^{i\theta})\). Rendered in your browser from the certified Taylor coefficients - nothing is computed server-side.

variant=1
variant=1 variant=2
Taylor series
r* ≈ 0.999
Radius of starlikeness r* ≈ 0.9990
proven f is starlike on |z| < r*; the colored disk shows the certified region.

Unit disk explorer - hover to evaluate

Hover over the disk

Related

Facts (8)

Property Kind Params Holds Value / r Status Confidence
K membership {"variant": 1} -23.0000 unscreened -
K membership {"variant": 2} -166.5196 unscreened -
r* radius {"variant": 1} - r ≤ 0.960 🔬 screened numerical_strong
r* radius {"variant": 2} - r ≤ 0.788 🔬 screened numerical_strong
S* membership {"variant": 1} r ≤ 0.999 ✓ proven rigorous_verified
S* membership {"variant": 2} r ≤ 0.600 ✗ disproven proven
S membership {"variant": 1} - unscreened -
S membership {"variant": 2} - unscreened -

Transitively Implied Properties

Because starlikeness is proven, these properties follow by classical implications (unconditional edges in the lattice):

S C

Verification Runs (5)

Verifier Property Direction Outcome Domain r Witness Engine
boundary_scan_centered_v31 starlike proves pass 0.999 - boundary_v3.1
boundary_scan_centered_v31 starlike disproves pass 0.600 0.8*exp(i*0.006136) boundary_v3.1
pointwise_starlike_iv starlike disproves pass 0.990 [0.99, 0.0] gft-0.1.0-reaudit-20260610
boundary_scan_polynomial starlike proves pass 0.999 - boundary_v3.0
boundary_scan_polynomial starlike disproves pass 0.600 0.8*exp(i*6.258642) boundary_v3.0

Parameter Sweep (5 verified instances, starlikeness × disk radius vs parameter)

Proven on full disk (r ≥ 0.999)   ·   Proven on partial disk   ·   Disproven (witness)

Instances (2)

{"variant": 1} {"variant": 2}
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