docstr: :param goal: Input expression to prove
  :type goal: sem.Expression
  :param assumptions: Input expressions to use as assumptions in
      the proof.
  :type assumptions: list(sem.Expression)
code: def __init__(self, goal=None, assumptions=None, prover=None):
      """
      :param goal: Input expression to prove
      :type goal: sem.Expression
      :param assumptions: Input expressions to use as assumptions in
          the proof.
      :type assumptions: list(sem.Expression)
      """
      if prover is not None:
          assert isinstance(prover, TableauProver)
      else:
          prover = TableauProver()
  
      BaseProverCommand.__init__(self, prover, goal, assumptions)
  
imports: from nltk.inference.api import BaseProverCommand, Prover
  from nltk.internals import Counter
  from nltk.sem.logic import AbstractVariableExpression, AllExpression, AndExpression, ApplicationExpression, EqualityExpression, ExistsExpression, Expression, FunctionVariableExpression, IffExpression, ImpExpression, LambdaExpression, NegatedExpression, OrExpression, Variable, VariableExpression, unique_variable
label_desc: Use image node_id 1 to create a new TableauProverCommand object from inherited base classes: BaseProverCommand with example: obj = TableauProverCommand(goal, assumptions, prover)