no, this is patently false MOST things are sandwiches
And in fact, good tacos will have TWO tortillas. All the sandwich bits are just sitting on top of the two pieces of bread.
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is there something placed between the two tortillas? if NOT, then NOT a sandwich
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There is air between the tortillas. SANDWICH
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if you say that it's an air sandwich then you fall into the degenerate sandwich case: spherical filling enclosing one piece of "bread"
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Likewise, an ordinary donut cannot be considered a sandwich, even if cut across the toroidal plane
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interesting but probably not relevant for this particular consideration
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however with gaseous fillings there probably cannot be an isomorphism constructed to a topological sandwich
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unless you say that it is a sandwich constructed in a vacuum and is a sandwich for the mere instant that the gaseous filling is betwixt the
End of conversation
New conversation -
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I think you're unhelpfully relegating sandwiches two two dimensions.
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