symmetric_disk_engine.py
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	import fenics as fen
	import mshr
	from rrompy.hfengines.fenics_engines import HelmholtzProblemEngine

	class SymmetricDiskEngine(HelmholtzProblemEngine):
	def __init__(self, k0:float, n:int):
	super().__init__(mu0 = [k0])
	mesh = mshr.generate_mesh(mshr.Circle(fen.Point(0., 0.), 1.), n)
	self.V = fen.FunctionSpace(mesh, "P", 1)
	x, y = fen.SpatialCoordinate(self.V.mesh())[:]
	self.forcingTerm = [fen.exp(x + y) * (1. - x 2. - y 2.),
	fen.exp(x - y) * (1. - x 2. - y 2.)]
	self.cutOffPolesIMin, self.cutOffPolesIMax = -1e-2, 1e-2