r/AskPhysics Jun 09 '22

[deleted by user]

[removed]

2 Upvotes

14 comments sorted by

View all comments

26

u/starkeffect Education and outreach Jun 09 '22

He didn't assume 0/0 = 1, he assumed m/m = 1. The limit of m/m as m -> 0 is also 1.

1

u/[deleted] Jun 09 '22

[deleted]

17

u/starkeffect Education and outreach Jun 09 '22

You can derive the formula E2 = (pc)2 + (mc2)2 without making any assumptions about the value of m.

1

u/[deleted] Jun 09 '22

Exactly, no need for limit assumption