Re: v = cz ?

On Oct 1, 10:43 pm, shala...@xxxxxxxxx wrote:
On Oct 1, 7:21 am, mluttg...@xxxxxxxxxx wrote:

Wich observations lead to v = cz, but not
to v = cz / (1+z) ?

Marcel Luttgens

When z is observed to be anything but 0?

Perhaps I'm missing the point, but
0 = c*0
0 = c*0 / (1 + 0)

c = c*1
c/2 = c*1 / (1 + 1)

2*c = c*2
2*c / 3 = c*2 / (1 + 2)

- Shawn

You are missing different points! :-)
v = cz / (1+z) is of course valid for z = 0!
Then v = 0/1 = 0.
When z is infinite, one gets v = c.
Indeed, v = cz / (1+z) can be written
v = c / (1/z + 1), which then reduces to v = c/1 = c.

Marcel Luttgens

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