Prefer a chat interface with context about you and your work?
Central extensions of cotangent universal hierarchy: (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mn>2</mml:mn><mml:mo>+</mml:mo><mml:mn>1</mml:mn></mml:math>)-dimensional bi-Hamiltonian systems