Hi Jim,
That is more or less true. But the claim being disputed here is the
other way around; that voltages and currents generate discontinuities.


Actually, the claim was there is reflection from a virtual discontinuity.
Almost the same thing?
I agree that there isn't in the sense that an open 1/4 wave stub looks
like a short but the reflections which appear to have come the short
actually come from the open end, but how can you introduce a stub
without also introducing a physical discontinuity which will give a real
reflection (such reflection of course, not being that which would come
from a short)?
Alan