So ( to recap ) you don't know if Einstein explicitly said
something like: “ Photons have no rest mass. â€.
I can't believe he was silent on this matter.
You told me:
“ If I come across a place where Einstein indicates that
light has zero rest mass ( aka proper mass ) [ or not ]
then I'll let you know. â€.
Thanks, that would be grand ! I love your non-judgmental attitude.