It's possible you're referring to one of the following:
* A specific poet named Carl who writes poetry incorporating arithmetic elements.
* A misunderstanding of a specific type of poetry. Maybe you're thinking of concrete poetry which often uses visual patterns and shapes to represent words and ideas, potentially resembling mathematical formulas.
* A unique form of poetry created by someone. It could be a personal invention or a small, niche community's creation.
To help me understand, please clarify the following:
* Who is Carl? Is this a specific poet you're referring to?
* What kind of poetry are you thinking of? Can you give me an example or describe it further?
Once I have more information, I can tell you more about the purpose, audience, and relevance of detail for this specific type of poetry.