A lecturing professor with oils on their fingers, sitting at a cluttered wooden desk, surrounded by stacks of books and papers, with a projector screen behind them displaying equations and formulas, and a whiteboard filled with complex mathematical symbols, with a single, flickering overhead lamp casting an warm glow on their face, with a hint of a smile and a bespectacled gaze looking directly at the viewer.

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A lecturing professor with oils on their fingers, sitting at a cluttered wooden desk, surrounded by stacks of books and papers, with a projector screen behind them displaying equations and formulas, and a whiteboard filled with complex mathematical symbols, with a single, flickering overhead lamp casting an warm glow on their face, with a hint of a smile and a bespectacled gaze looking directly at the viewer.