디스가이아2 PSP

 # 주의해야하는 숨겨진 캐릭터 조건(기회가 제한된 것)

에트나는 chapter 9 후

Kurtis - Enter the Land of Carnage. 

Axel - Enter the Land of Carnage.

Fubuki - Beat the story stage in Zenon's Castle where he is an ally. 

Mid-Boss - Have at least 20 hours of play time, have at least one character
with 400+ mana, and you must not have gotten Etna yet. There will be a bill
called "I want to see the ending!" Pass it and beat the stage that appears.
Doing so will lead to an ending (and a new song) so make sure you do 
everything you want to do in the currecnt cycle first. On the new game, pass
the same bill again. After it's passed, do not go to the Mid-Boss stage again,
but instead have Adell enter a Dark Assembly. An option called "Allow moi to
join" appears. Pass it and we're done.

Pink ,Actress,Main Hero B - Beat Axel Mode and enter the Land of Carnage. Axel must be in your
party before you can proceed. Then have Adell attend a Dark Assembly and
there should be a bill from her. Pass it and she joins, but only in the Land 
of Carnage!

Prism Red - Defeat the optional "Hero Show Event" map that shows up after
losing to Laharl in Shinra Tower. Next use 5 Prism Ranger Cell Phones.
Have Adell enter a dark assembly as a Senator and there should be a bill 
called "Be My Friend" by a Prism Ranger. 

Mr. Champloo - You must have beaten Axel Mode, have at least one unit with 
9999+ mana, and have at least 50 hours of play time. There will be a bill

Raspberyl - Defeat her special map "This is Taboo Love".  You will need 30 Dark World maps cleared and have beaten
Mr. Champloo 

Mao - Defeat his special map "Final Departure". 
You will need to have beaten Mr. Champloo and have access to the
Land of Carnage 

Flonne - Pass a bill to fight Laharl after losing to him in story mode. The stage must be beaten in Holt Village for it to count.


Laharl - Dark Assembly and look
for the proposal "Summon Laharl". 

Priere - You must not have recruited Etna yet, and have at least one character
with a 66+ Felony stamp and at least one character with 100+ mana. A bill
"Unleash the Fallen Maiden" 

Marjoly - Have at least one character with a 99 Felony stamp and at least one 
character with 1500+ mana. A bill "Break the Mysterious Seal" should appear. 

Zetta - Beat at least 10 Dark World maps and have at least one character with
3000+ mana. A new bill called "Meet the Strongest Overlord" should appear. 

Asagi (monster) - at least
one character with a 33+ displayed felony, at least one character with 100+ 
mana and be on a new cycle. There should be a bill to "Fight a Hero from 
Another Game". 

Asagi (human) - Raise monster Asagi to level 2000+.  a bill from her that says "Make me human". Do note that when she transforms, her equipment stays on her
monster form, and vice versa, and can only be recovered by transforming again.

Gordon - Defeat the second Defender of Earth map. The map is accessed by using
6 Defender of Earth cell phones and beating the first Defender of Earth stage.

Feynmann Hellmann theorem, Virial theorem

Feynmann Hellmann theorem, Virial theorem 이 무슨 내용이었는지 자꾸 잊어버려서 여기에 정리함. 

(1) Feynmann Hellmann theorem : 간단하게 요약하면 Hamiltonian 이 parameter dependent인 경우

으로 쓸 수 있다는 것이다. 간단해 보이지만, 완전히 trivial 하지는 않은 것은 , 오른쪽에 wave function에 대한 미분이 없다는 것이다. 좀 더 자세한 것은 위키피디아에 이미 잘 정리되어 있다. https://en.wikipedia.org/wiki/Hellmann%E2%80%93Feynman_theorem 

(2) Virial theorem: bound state 에 대한 variational approximation |Psi> to H = T +V는 

다음과 같은 relation을 만족한다. 

Virial 이란 단어는 라틴어 vis ( "force", "energy") 에서 왔다. 

왜 Virial theorem이 중요한가? 위키피디아에 따르면 

The significance of the virial theorem is that it allows the average total kinetic energy to be calculated even for very complicated systems that defy an exact solution, such as those considered in statistical mechanics; this average total kinetic energy is related to the temperature of the system by the equipartition theorem. However, the virial theorem does not depend on the notion of temperature and holds even for systems that are not in thermal equilibrium.