What is the theme in Once Again I Prove the Theory of Relativity by Sandra Cisneros?

Romantic love is a major theme in the poem. The title of the poem, "Once Again I Prove the Theory of Relativity" is meant humorously. It refers to Albert Einstein's special theory of relativity, published in 1905, and his general theory of relativity, developed in 1915 and 1916. Using calculations based on the postulate of the uniform speed of light and the relativity of motion (the motion of something can be determined only by its relation to something else), Einstein showed that time is measured differently for people moving relative to one another. At speeds of light, time would slow to near zero.