Struct ExtremeRay 

pub struct ExtremeRay {
    pub generator: String,
    pub k_degree: i64,
    pub contraction_type: ContractionType,
}

An extremal ray in the Mori cone NE(X).

Geometrically, this is a half-line R ⊂ NE(X) satisfying K_X · R < 0 (for the MMP), and any effective curve class on the ray is a positive multiple of the generator.

Fields

generator: String

Name or description of the ray generator.

k_degree: i64

Degree K_X · C for a generator C (should be < 0 for K-negative rays).

contraction_type: ContractionType

The type of the associated contraction (small, divisorial, or fiber).

Implementations

impl ExtremeRay

pub fn new( generator: impl Into<String>, k_degree: i64, ty: ContractionType, ) -> Self

Create a new extremal ray.

pub fn is_k_negative(&self) -> bool

Whether the ray is K-negative (required for MMP).

pub fn mmp_step(&self) -> MmpStep

The MMP step corresponding to this ray.

Trait Implementations

impl Clone for ExtremeRay

fn clone(&self) -> ExtremeRay

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ExtremeRay

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.