Perhaps you are looking for a mathy Valentine,
or a Valentine for a mathy person . . . or both.
This link leads to the results of a blog-search using VALENTINE
and offers lots of math-poetic possibilities.
Mathematical language can heighten the imagery of a poem; mathematical structure can deepen its effect. Feast here on an international menu of poems made rich by mathematical ingredients . . . . . . . gathered by JoAnne Growney.