Exact Solutions of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:msup><mml:mi>ϕ</mml:mi><mml:mn mathvariant="bold">4</mml:mn></mml:msup></mml:mrow></mml:math>Equation Using Lie Symmetry Approach along with the Simplest Equation and Exp-Function Methods
Abstract and applied analysis