I am preparing for my Ph.D. oral defense in mathematics and am reading tips from various resources. It seems that the usage of slides is usually assumed, though it is generally not required. For me, I am more used to the more traditional way; that is, using whiteboard and markers. I have almost never used slides in my past part-time teachings.
Is it a bad idea to use whiteboard and markers instead of slides in my Ph.D. oral defense?
If I use whiteboard, what if the committee have questions about the contents that I have already erased in my presentation?