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At one point, Ed, Al, and Ling end up in a battle involving Gluttony. Then,

> Ed, Ling, and Envy are swallowed by Gluttony, which lands them in another
> dimension.

It is also stated more than once that alchemists use the energy from the
movement of the tectonic plates of the Earth's crust (though this is not
entirely accurate, the inaccuracy is irrelevant for the purpose of this
question). This energy would not be present on another planet, much less in
another dimension.

> In order to escape from this alternate dimension, Ed performs human
> transmutation. He uses Envy's philosopher's stone to do so, meaning that he
> would not require this energy. However, prior to finding Envy, Ed uses
> alchemy to fashion a cooking pot (evidenced by the transmutation marks on
> the pot). He also uses it to turn the iron from the blood into a weapon.

This should not be possible; there should be no energy for the use of alchemy
in that dimension. Is this an oversight by the writer(s), or is there some
explanation?


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fullmetal-alchemist-series fullmetal-alchemist-2003
How can alchemy be used in another dimension?


It is later revealed that

> The energy source for Amestrian alchemy is human souls, just like how
> philosopher's stones are made and used.

Gluttony was meant to host a philosopher's stone in his body formed from the
red water and humans he consumed, so

> I would say that there is vast alchemical fuel in his "stomach", or whatever
> you call that alternate dimension that consumed objects are transported to.

Hence, alchemy should be possible in that dimension.


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From an [FMA wiki article about Gluttony](http://fma.wikia.com/wiki/Gluttony):

> ...Envy, Ling, and Ed burst out from Gluttony's stomach after Ed used Envy's
> Philosopher's Stone to perform a reverse human transmutation on himself to
> reopen Gluttony's gate.


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