/sci/ - Science & Math

>>8002497

Use some common sense. Of course you are ever changing matter.

>people who forget past experiences stop being themselves, too?

yes, depending on how much they forget. They become a shell of their former self. I personally know people with dementia and alzhimerz and I can attest to them being nothing like their healthy self. The more they forget, the more confused and angry they become. Kind of like babies.

There is no you to begin with. (inb4 some smart ass brochan comment) like >>8002250 You are constantly changing every second. Even a simpleton can understand that. And by die I mean the self perpetuating pattern that is "you" stops its continuation. That doesn't mean it can't repeat over and over.

General Relativity question

In my class my prof talked about finding the solution to Einstein's equation for a spherically symmetric body in vacuum. He then said that the ricci tensor vanishes.

I am a little confused about this point. Since we're in vacuum T_uv vanishes, but why does that necessarily mean that Ruv vanishes as well. Couldn't it be that Ruv - 1/2 guv R also happens to vanish for all components? Or is that simply impossible?

In summary, why does vacuum imply vanishing Ricci tensor?

is the heat death of the universe the same as saying maximum entropy the same as modeling the universe as an ideal gas at absolute zero?

Observing requires performing work, which makes this state hard for me to visualize.