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## Main Question or Discussion Point

I have a question concerning renormalization of QED. I don't know if

Feynman diagrams with counterterms on ecternal legs are allowed.

Normally to find S matrix amputated green function is necesary and to find

it one don't take into account all propagators on external legs - they

are canceled according to LSZ formula.

Feynman diagrams with counterterms on ecternal legs are allowed.

Normally to find S matrix amputated green function is necesary and to find

it one don't take into account all propagators on external legs - they

are canceled according to LSZ formula.