Vvedenie V Elementarnuyu Geometriyu I Trigonometriyu Lobachevskogo

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V nastoyaschej state dano takoe izlozhenie pervyh ponyatij i teorem geometrii i trigonometrii Lobachevskogo (po najdennomu avtorom metodu), kotoroe ne strozhe izlozheniya uchebnikov Davidova ili Kiseleva i ne trudnee ego. V vidu ogranichennyh razmerov stati, izlozheny tolko te ponyatiya i teoremy geometrii Lobachevskogo, kotorye neobhodimy dlya vyvoda osnovnyh formul ego trigonometrii. This book, Vvedenie v elementarnuyu geometriyu i trigonometriyu Lobachevskogo, by N.N. Iovlev, is a replication of a book originally published before 1930. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible.