"Poetry is a sort of inspired mathematics, which gives us equations,
not for abstract figures, triangles, spheres and the like, but equations
for the human emotions. If one have a mind which inclines to magic
rather than science, one will prefer to speak of these equations
as spells or incantations; it sounds more arcane, mysterious, recondite."
The complete article is available here.
And, in a footnote* to the poem "In a Station of the Metro" -- found in my Norton Anthology of Modern Poetry we find a bit more of Pound's mathematical thinking.