It seems there might be a mix-up with the term "Anna Cartan." It's possible you meant "Cartan," which could refer to Élie Cartan, a French mathematician known for his work in differential geometry and Lie theory. Cartan developed several important concepts and theorems in mathematics, particularly in the areas of differential forms and symmetric spaces. If "Anna Cartan" refers to something specific or a different context (such as a fictional character, a contemporary figure, etc.
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