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We would like to introduce D-branes and make various remarks on string
theory amplitudes and their relations to mathematics in type II string
theory in which getting the exact and final form of the world sheet
integrals up to five point mixed closed-open amplitudes to all orders
are given.
We are also going to to talk about all kinds of effective actions
involving DBI, Chern-Simons and more importantly new Wess Zumino
actions. Indeed we try to provide a comprehensive explanation even for
D-brane-anti D-brane systems. We also introduce various new techniques
to be able to derive all order α’ corrections to all type II super
string effective actions. If time allows, we then mention several issues
related to those effective actions as well.