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deferred class
	EG_PARTICLE_SIMULATION [G -> NUMERIC]

General
	cluster: physics
	description: 
		"In an EG_PARTICLE_SIMULATION any number of EG_PARTICLEs are interacting with each
		other in a way that is defined by the implementer of n_body_force. The force
		affecting a_particle can be retrieved by querying force resulting a NUMERIC
		describing the force. Currently there are two implementation for n_body_force_solver:
		
		(best case) runtime
		EG_PARTICLE_SIMULATION_N2O (n^2)
		EG_PARTICLE_SIMULATION_BHO (n log n)
		
		EG_PARTICLE_SIMULATION_N2 uses the straight forward way to calculating the force, meaning
		comparing each particle with each other.
		EG_PARTICLE_SIMULATION_BH uses the method proposed by Barnes and Hut (see comment there for
		more information).
		EG_PARTICLE_SIMULATION works for EG_PARTICLE located in a two dimensional space."

Ancestors
	ANY

Queries
	force (a_particle: [like particle_type] EG_PARTICLE): G
	particles: LIST [[like particle_type] EG_PARTICLE]

Commands
	set_particles (a_particles: [like particles] LIST [[like particle_type] EG_PARTICLE])

Constraints
	particles exist
	particles not empty



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