"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.
In a Station of the Metro* by Ezra Pound
The apparition of these faces in the crowd;
Petals on a wet, black bough.
*Of this poem Pound writes in GaudierBrzeska: Three years ago in Paris I got out of a 'metro' train at La Concorde, and saw suddenly a beautiful face, and then another and another, and then a beautiful child's face, and then another beautiful woman, and I tried all that day to find words for what this had meant to me, and I could not find any words that seemed to me worthy, or as lovely as that sudden emotion. And that evening . . . I was still trying and I found, suddenly, the expression. I do not mean that I found words, but there came an equation . . . not in speech, but in little splotches of color . . . The 'one-image poem' is a form of super-position, that is to say, it is one idea getting out of the impasse in which I had been left by my metro emotion. I wrote a thirty-line poem and destroyed it . . . Six months later I made a poem half that length; a year later I made the following hakku-like sentence.