2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49866We find that the mixture of Ramond-Ramond fields and Neveu-Schwarz two form are transformed as Majorana spinors under the T-duality group $O(d,d)$. The Ramond-Ramond field transformation under the group $O(d,d)$ is realized in a simple form by using the spinor representation. The Ramond-Ramond field transformation rule obtained by Bergshoeff et al. is shown as a specific simple example. We also give some explicit examples of the spinor representation.8 pages, no figures. correct some minor mistakes, add one section of examples, add one referenceHigh Energy Physics - Theorytext