Flaw in Reasoning

[180nce]

Hello LSATers,
Can someone please help me out with the following statement:

This painting titled La Toilette is Berthe Morisot’s La Toilette only if a painting can be in two museums at the same time. Since nothing can be in two places at once, this painting must somehow have been mistitled.

What is the flaw in reasoning?
Is the flaw that the argument assumes that the particular painting they are referring to is not the real painting?



Thanks so much in advance!

[Adam Tyson]

Looks like this question has some underlying assumptions that have to be dealt with, and assumptions are fertile ground for flaws. The stem seems to imply that the painting in question is currently found in some other museum, and that the one in the other museum is the real one. My prephrase here would be something like "the author has presumed, without justification, that the real painting is currently in another museum."

But there is another assumption here, a bit more subtle perhaps - the author appears to have assumed that only one painting can be titled La Toilette. Okay, sure, maybe the real Morisot painting is elsewhere, but that doesn't mean this painting is mistitled - maybe this La Toilette is not that artist's work but is instead the work of, say, Gizmo the Magnificent, and it just happens to have the same title as the other painting? For that flaw, my prephrase would be something like "the author has assumed, without justification, that no two paintings can have the same title".

If I had to categorize this (which we don't HAVE to do - don't fall into that trap; categories are there to help us, not stump us or waste our time), I might say it was a false dilemma, or I might call it an evidence flaw (a general lack of relevant evidence, perhaps). If I was to put on my lawyer hat I might say the author assumed facts not in evidence. Regardless of what you call it, the focus should be on the conclusion - the painting must be mistitled - and in showing some reason why the premises don't necessarily add up to that.

[180nce]

Thanks for the answer Adam!