class_docstr: Add homology properties of a scalar field f: R^n --> R associated with
  the geometry built from the VertexBase class
class_docstr_tok: ["Add","homology","properties","of","a","scalar","field","f",":","R^n","--",">","R","associated","with","the","geometry","built","from","the","VertexBase","class"]
docstr: Check whether this vertex is strictly less than all its
  neighbours
docstr_tok: ["Check","whether","this","vertex","is","strictly","less","than","all","its","neighbours"]
code: def minimiser(self):
      """Check whether this vertex is strictly less than all its
      neighbours"""
      if self.check_min:
          self._min = all(self.f < v.f for v in self.nn)
          self.check_min = False
  
      return self._min
  
imports: import collections
  from abc import ABC, abstractmethod
  import numpy
  from scipy._lib._util import MapWrapper
label_desc: Use image node_id 4 for calling the VertexScalarField obj's underlying member method code with example usage: obj.minimiser() and returns: self