Strong rule: style --- 3D Pixar ---. 3D Pixar style. The professor stands confidently holding a piece of chalk. On the board behind him, the coefficients are color-coded in Russian: 'a - первый', 'b - второй', 'c - свободный член'. Cheerful and bright atmosphere.
Character appearance reference (MUST match exactly):
- Профессор Архимед: A friendly, energetic math professor in 3D Pixar style. He has messy white hair, round glasses, a neat beard, wearing a tweed jacket with elbow patches and a bright bow tie. Expressive face, warm smile, animated gestures.
