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  "body": "\n## Statement\n\nLet *w* ∈ *F*(*A*) be such that *w* = 1 in *G*. Then the *area* of *w*, denoted Area(*w*), is defined as the minimum of the areas of all Van Kampen diagrams with boundary labels *w* (Van Kampen's lemma says that at least one such diagram exists).\n\nOne can show that the area of *w* can be equivalently defined as the smallest *n*≥0 such that there exists a representation (♠) expressing *w* as a product in *F*(*A*) of *n* conjugates of the defining relators.\n",
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