So the method of converting a partial differential equation to an ordinary differential equation by combining the independent variables in a specific way is known as the method of combination of variables.
तर एका विशिष्ट मार्गाने स्वतंत्र चल एकत्र करून partial differential समीकरण हे ordinary differential समीकरणात रुपांतरीत करण्याची पद्धतीला चलांच्या संयोजनाची पद्धत म्हणतात.