@ff524 я редактировал вопрос, но для уточнения, вопросы, которые вы упомянули выше (только для написания писем, это письмо обязательно и т. д.). были написаны как подвопрос из главных какова роль...', чтобы указать, какие вещи я хотел бы получить ответ сослаться. @xLeitix на самом деле для большего количества цитирования оценок имеет тенденцию быть слишком оптимистичными, т. е. h-индекс обычно меньше; также наблюдаются Хирш и документированы в бумажной Юн. @Vladhagen это очень интересно. Для чего это стоит, пусть записи показывают, что некоторые преподаватели активно не нравится такая поза, и будет гораздо более склонен хотели (и хотят работать с) студент воспринимается как искренний, честный и любознательный (например, задавая много вопросов, в том числе “немые” те,) по сравнению с высокомерным всезнайкой.

Искать вокруг. Есть инициативы, Распространение бесплатно (даже с открытым исходным кодом) учебники, как техник книги, есть много других. Задать дружественный Гугл.

Некоторые люди устроены с их издателя, чтобы иметь возможность распространять свои книги бесплатно, как Андерсон "техники безопасности", я знаю несколько других. (Да, я сама эту книгу в бумаге тоже. Два издания, даже. Стоит каждую копейку.) Иногда вы найдете, что книга вышла из печати, и теперь автор распространяет последнее издание в электронном виде.

Кроме того, глядя вокруг вы найдете (более или менее) полный конспект лекций. Я предпочитаю Уильяма Чена заметки о преддипломной математики, но есть много других. Качество (и полноты), очевидно, может быть очень разной, и иногда вы найдете только неполные, короткие документы. Лучший из всех, что копается в веб-страницы для классов, вы зачастую найдете домашнее задание и экзамены, скорее всего, с решениями.

Если есть (по крайней мере, отдаленно связанные) сайт СЭ, есть вероятность, что кто-то уже спрашивал свободных текстов, поиск (или задать) там тоже есть.

Для любого более четкие ответы, вы будете иметь, чтобы спросить о конкретном содержании.

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