Prompt
Create a realistic image of a mature 20th-century male mathematician, dressed in formal attire, sitting at a desk with mathematical texts and papers, in a study or library setting. The man has a distinguished face with a slight smile, wearing glasses and a suit. In the background, there are bookshelves with mathematical and scientific literature. The overall style should be reminiscent of the mid-20th century. The man is sitting in a chair, with one hand resting on a book titled "Moderne Algebra".