Prompt
Generate a realistic image of a middle-aged German mathematician from the early 20th century, sitting at a desk with papers and mathematical equations, wearing formal attire typical of the era. The background should include bookshelves and a university logo or a blackboard with mathematical formulas. The man should have a serious expression, with a hint of concentration, and be holding a pen or pencil. Incorporate elements that reflect his German heritage and his contributions to mathematics, such as a chalkboard with the Krull dimension or Krull ring equations. The style should be reminiscent of a formal portrait from the 1940s or 1950s.
