Матеріал з Вікіпедії — вільної енциклопедії.
Подстраница "Користувач:Галактион/Правило Лопіталя" создана для того, чтобы перенести информацию:
- 1) которая размещена в разделе "Обговорення" статьи "Правило Лопіталя",
- 2) ценность которой вызывает сомнения у по меньшей мере одного пользователя Украинского раздела Wikipedia.
Галактион 11:15, 4 березня 2010 (UTC)
![{\displaystyle ~\land \quad a\in \mathbb {X} _{\mathrm {f} }\cap \mathbb {X} _{\mathrm {g} }\quad \land \quad \lim _{x\to a}f(x)=\lim _{x\to a}g(x)\quad \land \quad \{\lim _{x\to a}f(x),\ \ \lim _{x\to a}g(x)\}\ \subseteq \ \{\{-\infty \},\ \{0\},\ \{\infty \}\}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/e70fca00ac11398180026f58cee6b8af6f835d8b)
![{\displaystyle ~\land \quad \exists _{\delta \ \in \ (0,\infty )}\ \forall _{x\ \in \ \mathbb {X} _{\mathrm {f} }\ \cap \ \mathbb {X} _{\mathrm {g} }\ \land \ 0\ <\ |x-a|\ <\ \delta }\ (f'(x)\in \mathbb {R} \ \ \land \ \ g'(x)\in \mathbb {R} \setminus \{0\})}](https://wikimedia.org/api/rest_v1/media/math/render/svg/4449c66f73cb3a5ad622bedcbfaacf71d9fe7d5a)
![{\displaystyle ~\to \quad (\ \exists _{L\ \in \ \mathbb {R} }\ (\lim _{x\to a}{\frac {f'(x)}{g'(x)}}=L)\quad \to \quad \lim _{x\to a}{\frac {f(x)}{g(x)}}=\lim _{x\to a}{\frac {f'(x)}{g'(x)}}\ )}](https://wikimedia.org/api/rest_v1/media/math/render/svg/5bd56b9ebd680580deb755d4c1116faf1e55d473)
- Notes
![{\displaystyle ~\mathrm {f} :\mathbb {X} _{\mathrm {f} }\mapsto \mathbb {Y} _{\mathrm {f} }\quad \Leftrightarrow \quad \mathrm {f} =\{\langle x,y\rangle |\quad \langle x,y\rangle \in \mathbb {X} _{\mathrm {f} }\times \mathbb {Y} _{\mathrm {f} }\quad \land \quad y=f(x)\ \}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/a9fe3fa9b6b7d419a4d27245b46489b75ffc11db)
![{\displaystyle ~\vdash \quad \mathbb {X} _{\mathrm {f} }\times \mathbb {Y} _{\mathrm {f} }=\{\langle x,y\rangle |\quad x\in \mathbb {X} _{\mathrm {f} }\quad \land \quad y\in \mathbb {Y} _{\mathrm {f} }\ \}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/cda83f43fce3e86ca18d2c61f2aed6cdf9ab9902)
![{\displaystyle ~\mathbb {X} _{\mathrm {f} }\times \mathbb {Y} _{\mathrm {f} }\subseteq \mathbb {R} ^{2}\quad \Leftrightarrow \quad \forall x\forall y\ (\ \langle x,y\rangle \in \mathbb {X} _{\mathrm {f} }\times \mathbb {Y} _{\mathrm {f} }\ \to \ \langle x,y\rangle \in \mathbb {R} ^{2}\ )}](https://wikimedia.org/api/rest_v1/media/math/render/svg/f2cc2c6fb0a53f1adeb5312471981ae32d40b931)
![{\displaystyle ~\mathrm {g} :\mathbb {X} _{\mathrm {g} }\mapsto \mathbb {Y} _{\mathrm {g} }\quad \Leftrightarrow \quad \mathrm {g} =\{\langle x,y\rangle |\quad \langle x,y\rangle \in \mathbb {X} _{\mathrm {g} }\times \mathbb {Y} _{\mathrm {g} }\quad \land \quad y=g(x)\ \}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/ff3f7f3eb457dd5b17895f9fec56bc06b61f6f50)
![{\displaystyle ~\vdash \quad \mathbb {X} _{\mathrm {g} }\times \mathbb {Y} _{\mathrm {g} }=\{\langle x,y\rangle |\quad x\in \mathbb {X} _{\mathrm {g} }\quad \land \quad y\in \mathbb {Y} _{\mathrm {g} }\ \}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/5bda5d3ae9ee6b2f454b20157fcc9afc3027253c)
![{\displaystyle ~\mathbb {X} _{\mathrm {g} }\times \mathbb {Y} _{\mathrm {g} }\subseteq \mathbb {R} ^{2}\quad \Leftrightarrow \quad \forall x\forall y\ (\ \langle x,y\rangle \in \mathbb {X} _{\mathrm {g} }\times \mathbb {Y} _{\mathrm {g} }\ \to \ \langle x,y\rangle \in \mathbb {R} ^{2}\ )}](https://wikimedia.org/api/rest_v1/media/math/render/svg/9bfbb690bea09338e65aa1f4fa84ea21fd3cee3b)
![{\displaystyle ~a\in \mathbb {X} _{\mathrm {f} }\cap \mathbb {X} _{\mathrm {g} }\quad \Leftrightarrow \quad a\in \mathbb {X} _{\mathrm {f} }\ \ \land \ \ a\in \mathbb {X} _{\mathrm {g} }}](https://wikimedia.org/api/rest_v1/media/math/render/svg/d2e44f92bfe0b53753242fdd3d9b1cc7658a260c)
![{\displaystyle ~\vdash \quad \mathbb {X} _{\mathrm {f} }\cap \mathbb {X} _{\mathrm {g} }=\{x|\quad x\in \mathbb {X} _{\mathrm {f} }\quad \land \quad x\in \mathbb {X} _{\mathrm {g} }\ \}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/c34a8d5f6f61a511e21e20539d60741ef931ee57)
![{\displaystyle ~\lim _{x\to a}f(x)=-\infty \quad \Leftrightarrow \quad \forall _{m\ \in \ (-\infty ,\ 0)}\exists _{\delta \ \in \ (0,\ \infty )}\ \forall _{x\ \in \ \mathbb {X} _{\mathrm {f} }}\ (0<|x-a|<\delta \ \to \ f(x)<m)}](https://wikimedia.org/api/rest_v1/media/math/render/svg/2adbde6f74640a1954fa4a3e359af53bd9a7e8b6)
![{\displaystyle ~\lim _{x\to a}g(x)=-\infty \quad \Leftrightarrow \quad \forall _{m\ \in \ (-\infty ,\ 0)}\ \exists _{\delta \ \in \ (0,\ \infty )}\ \forall _{x\ \in \ \mathbb {X} _{\mathrm {g} }}\ (0<|x-a|<\delta \ \to \ g(x)<m)}](https://wikimedia.org/api/rest_v1/media/math/render/svg/abed159b98004b319f46ce29dd77c22db6cc15ca)
![{\displaystyle ~\lim _{x\to a}f(x)=0\quad \Leftrightarrow \quad \forall _{\varepsilon \ \in \ (0,\ \infty )}\ \exists _{\delta \ \in \ (0,\ \infty )}\ \forall _{x\ \in \ \mathbb {X} _{\mathrm {f} }}\ (0<|x-a|<\delta \ \to \ |f(x)|<\varepsilon )}](https://wikimedia.org/api/rest_v1/media/math/render/svg/21d1f71c2e599df63f88c5913d53cac438509895)
![{\displaystyle ~\lim _{x\to a}g(x)=0\quad \Leftrightarrow \quad \forall _{\varepsilon \ \in \ (0,\ \infty )}\ \exists _{\delta \ \in \ (0,\ \infty )}\ \forall _{x\ \in \ \mathbb {X} _{\mathrm {g} }}\ (0<|x-a|<\delta \ \to \ |g(x)|<\varepsilon )}](https://wikimedia.org/api/rest_v1/media/math/render/svg/bcbe30f85dc271a3105214df550b7de9dc80106a)
![{\displaystyle ~\lim _{x\to a}f(x)=\infty \quad \Leftrightarrow \quad \forall _{M\ \in \ (0,\ \infty )}\ \exists _{\delta \ \in \ (0,\ \infty )}\ \forall _{x\ \in \ \mathbb {X} _{\mathrm {f} }}\ (0<|x-a|<\delta \ \to \ f(x)>M)}](https://wikimedia.org/api/rest_v1/media/math/render/svg/e205e43c90c13c16b7202fca7d49d820e216792a)
![{\displaystyle ~\lim _{x\to a}g(x)=\infty \quad \Leftrightarrow \quad \forall _{M\ \in \ (0,\ \infty )}\ \exists _{\delta \ \in \ (0,\ \infty )}\ \forall _{x\ \in \ \mathbb {X} _{\mathrm {g} }}\ (0<|x-a|<\delta \ \to \ g(x)>M)}](https://wikimedia.org/api/rest_v1/media/math/render/svg/cee52a3d00ea85c496b42d5db6c1a9c86ea05032)
![{\displaystyle ~\vdash \quad f'(x)=\lim _{h\to 0}{\frac {f(x+h)-f(x)}{h}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/551a0241062d14e56ea75db2a8708fc840764e92)
![{\displaystyle ~f'(x)\in \mathbb {R} \quad \Leftrightarrow \quad \exists y\ (y\in \mathbb {R} \ \ \land \ \ y=f'(x)\ )\quad \Leftrightarrow \quad \exists _{y\ \in \ \mathbb {R} }\ (y=f'(x))}](https://wikimedia.org/api/rest_v1/media/math/render/svg/5610a24c6e90943c386b67990ffe94dd24db7c90)
![{\displaystyle ~\vdash \quad g'(x)=\lim _{h\to 0}{\frac {g(x+h)-g(x)}{h}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/dc54d10fa0b4b6be3656739381751be40e8457dd)
![{\displaystyle ~g'(x)\in \mathbb {R} \setminus \{0\}\quad \Leftrightarrow \quad g'(x)\in \mathbb {R} \ \ \land \ \ g'(x)\notin \{0\}\quad \Leftrightarrow \quad g'(x)\in \mathbb {R} \ \ \land \ \ g'(x)\neq 0}](https://wikimedia.org/api/rest_v1/media/math/render/svg/b1c4215879b5316946ad479ba962db83283c7262)
![{\displaystyle ~\exists _{L\ \in \ \mathbb {R} }\ (\lim _{x\to a}{\frac {f'(x)}{g'(x)}}=L)\quad \Leftrightarrow \quad \exists L\ (\ L\in \mathbb {R} \ \ \land \ \ \lim _{x\to a}{\frac {f'(x)}{g'(x)}}=L\ )\quad \Leftrightarrow \quad \lim _{x\to a}{\frac {f'(x)}{g'(x)}}\in \mathbb {R} }](https://wikimedia.org/api/rest_v1/media/math/render/svg/2804e25e76b49fea5d4f310871fa2a9c7eaca2b3)
Галактион 10:02, 4 вересня 2009 (UTC)