🧭 New here?
Take a guided tour of the site.
← Back to Families
This function is certified starlike - the sharp, proven-exact coefficient bounds for the starlike class apply to it. See the certified proofs →
Canonical Key
laguerre_polynomial
Parameter Space
nZ+ (integer)

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.

n=1
n=1 n=10
Taylor series
r* ≈ 0.300
Radius of starlikeness r* ≈ 0.3000
disproven 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 (19)

Property Kind Params Holds Value / r Status Confidence
K membership {"n": 2} -144.7841 unscreened -
K membership {"n": 3} -69.8850 unscreened -
K membership {"n": 4} -377.6525 unscreened -
r* radius {"n": 2} - r ≤ 0.960 🔬 screened numerical_strong
r* radius {"n": 3} - r ≤ 0.960 🔬 screened numerical_strong
r* radius {"n": 4} - r ≤ 0.960 🔬 screened numerical_strong
S* membership {"n": 10} r ≤ 0.300 ✗ disproven proven
S* membership {"n": 1} r ≤ 0.999 ✓ proven rigorous_verified
S* membership {"n": 5} r ≤ 0.600 ✗ disproven proven
S* membership {"n": 6} r ≤ 0.600 ✗ disproven proven
S* membership {"n": 7} r ≤ 0.300 ✗ disproven proven
S* membership {"n": 8} r ≤ 0.300 ✗ disproven proven
S* membership {"n": 9} r ≤ 0.300 ✗ disproven proven
S* membership {"n": 2} -198.6724 🔬 screened numerical_weak
S* membership {"n": 3} -85.4612 🔬 screened numerical_weak
S* membership {"n": 4} -141.9342 🔬 screened numerical_weak
S membership {"n": 2} - unscreened -
S membership {"n": 3} - unscreened -
S membership {"n": 4} - unscreened -

Transitively Implied Properties

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

S C

Verification Runs (23)

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*0.073631) boundary_v3.1
boundary_scan_centered_v31 starlike disproves pass 0.600 0.8*exp(i*6.135923) boundary_v3.1
boundary_scan_centered_v31 starlike disproves pass 0.300 0.6*exp(i*0.049087) boundary_v3.1
boundary_scan_centered_v31 starlike disproves pass 0.300 0.6*exp(i*6.037748) boundary_v3.1
boundary_scan_centered_v31 starlike disproves pass 0.300 0.6*exp(i*6.037748) boundary_v3.1
boundary_scan_centered_v31 starlike disproves pass 0.300 0.6*exp(i*0.343612) boundary_v3.1
pointwise_starlike_iv starlike disproves pass 0.990 [0.99, 0.0] gft-0.1.0-reaudit-20260610
pointwise_starlike_iv starlike disproves pass 0.990 [0.99, 0.0] gft-0.1.0-reaudit-20260610
pointwise_starlike_iv starlike disproves pass 0.990 [0.99, 0.0] gft-0.1.0-reaudit-20260610
pointwise_starlike_iv starlike disproves pass 0.990 [0.99, 0.0] gft-0.1.0-reaudit-20260610
pointwise_starlike_iv starlike disproves pass 0.990 [0.9605927690132365, -0.2395026766436712] gft-0.1.0-reaudit-20260610
pointwise_starlike_iv starlike disproves pass 0.990 [0.941545951132202, 0.3059268244311979] gft-0.1.0-reaudit-20260610
boundary_scan_polynomial starlike disproves pass 0.300 0.6*exp(i*6.025477) boundary_v3.0
boundary_scan_polynomial starlike proves pass 0.999 - boundary_v3.0
boundary_scan_polynomial starlike disproves pass 0.600 0.8*exp(i*0.073631) boundary_v3.0
boundary_scan_polynomial starlike disproves pass 0.600 0.8*exp(i*0.049087) boundary_v3.0
boundary_scan_polynomial starlike disproves pass 0.300 0.6*exp(i*0.122718) boundary_v3.0
boundary_scan_polynomial starlike disproves pass 0.300 0.6*exp(i*0.122718) boundary_v3.0
boundary_scan_polynomial starlike disproves pass 0.300 0.6*exp(i*0.122718) boundary_v3.0
boundary_scan_none starlike proves not_applicable - - boundary_v3.0
boundary_scan_none starlike proves not_applicable - - boundary_v3.0
boundary_scan_none starlike proves not_applicable - - boundary_v3.0

Parameter Sweep (23 verified instances, starlikeness × disk radius vs parameter)

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

Instances (10)

{"n": 2} {"n": 3} {"n": 4} {"n": 1} {"n": 5} {"n": 6} {"n": 7} {"n": 8} {"n": 9} {"n": 10}
↑↓ navigate openesc close
✦ You're explorer #4,030 to wander the registry - thanks for stopping by. Tell us what you'd like to see →
💬 Feedback