On Fri, Jan 11, 2019 at 4:57 PM Philip Thrift <cloudver...@gmail.com> wrote:

*> If Feynman Diagrams (tools) are sufficient (to match experimental data)
> then Quantum Field Theory can be thrown in the wastebasket.*

You don't have to use Feynman Diagrams, you can think about things the way
Julian Schwinger did and get the same correct answer; but a calculation
that might take Schwinger a month to do Feynman could do in a hour or so with
his diagrams. Both methods are mathematically consistent but neither gives
us a strong intuition why those troublesome physical infinities go away,
all we know is that they do and they give the right answer, aka they agree
with experiment.
John K Clark


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