Routh's, Menelaus' and Generalized Ceva's Theorems
نویسنده
چکیده
We use the following convention: A, B, C, A1, B1, C1, A2, B2, C2 are points of E2 T, l1, m1, n1 are real numbers, and X, Y , Z are subsets of E2 T. Let us consider X, Y . We introduce X is parallel to Y as a synonym of X misses Y . Let us consider X, Y , Z. We say that X, Y , Z are concurrent if and only if: (Def. 1) X is parallel to Y and Y is parallel to Z and Z is parallel to X or there exists A such that A ∈ X and A ∈ Y and A ∈ Z. One can prove the following propositions: (1) (A+B)1 = A1 +B1 and (A+B)2 = A2 +B2. (2) (l1 ·A)1 = l1 ·A1 and (l1 ·A)2 = l1 ·A2. (3) (−A)1 = −A1 and (−A)2 = −A2. (4) (l1 ·A+m1 ·B)1 = l1 · A1 + m1 · B1 and (l1 ·A+m1 ·B)2 = l1 · A2 + m1 ·B2.
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ورودعنوان ژورنال:
- Formalized Mathematics
دوره 20 شماره
صفحات -
تاریخ انتشار 2012