I am a Ph.D. student in mathematics. I have worked on a project and wrote a paper. A reputed old mathematician, who is not my supervisor but is an excellent and friendly human, in my opinion, consistently helped me to write the paper. I am about to submit the paper to a journal. When I offered authorship, the mathematician politely said that giving acknowledgment (in the acknowledgment section) in the paper would be enough.
So I have decided to acknowledge. But I am also thinking of dedicating to the mathematician's birthday on the paper's front page.
Is it normal to dedicate a paper to the birthday of someone who contributed to it? Or should I mention the contribution in the acknowledgment part?