Struct FirstVariation 

pub struct FirstVariation {
    pub functional: String,
    pub direction: String,
}

First variation δF[φ; η] of a functional F in direction η.

Fields

functional: String

Name of the functional being varied.

direction: String

Name of the variation direction (test function).

Implementations

impl FirstVariation

pub fn new(functional: impl Into<String>, direction: impl Into<String>) -> Self

Create a new FirstVariation record.

pub fn vanishes_at_critical_point(&self) -> bool

At a critical point, the first variation vanishes for all test functions. Returns true (fundamental theorem of variational calculus).

Trait Implementations

impl Clone for FirstVariation

fn clone(&self) -> FirstVariation

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FirstVariation

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

Formats the value using the given formatter.