A KZB-type differential equation and Picard iteration yield the all-order alpha-prime expansion of one-loop open-string integrals in terms of iterated Eisenstein integrals.
The second entry Z τ ⃗ η(∗|A) specifies permuta- tions A = a1a2
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All-order alpha'-expansion of one-loop open-string integrals
A KZB-type differential equation and Picard iteration yield the all-order alpha-prime expansion of one-loop open-string integrals in terms of iterated Eisenstein integrals.