Avoiding the limit notation during long algebraic manipulations For example, look at this:
$$
\begin{align}
\lim_{x \rightarrow \infty}\frac{x}{x+1} &= \lim_{x \rightarrow \infty}{\frac{\frac{x}{x}}{\frac{x}{x}+\frac{1}{x}}}\\
&= \lim_{x \rightarrow \infty}{\frac{1}{1+0}} \\
&= \lim_{x \rightarrow \infty}{\frac{1}{1}} \\
&= \lim_{x \rightarrow \infty}{1} \\
&= 1 \\
\end{align}
$$
Maybe this isn't the best example as most of those steps are unnecessary, but sometimes you end up with something like that, having to write $\lim_{x \rightarrow \infty}$ over and over again. Is there any notation or method one can use to avoid having to do this?
 A: I would write like this:
$$
\frac{x}{x+1} = {\frac{\frac{x}{x}}{\frac{x}{x}+\frac{1}{x}}}
\hspace{1em} \xrightarrow[x\to \infty]{} \hspace{1em}
 1 $$
A: You could just use language:
We note that $\frac{x}{x+1}=\frac{\frac{x}{x}}{\frac{x}{x}+\frac{1}{x}} \to  1$ as $x \to \infty$, since $\frac{1}{x}$ vanishes in the denominator.
A: Having commented, edited and almost commented again, I realize it is better if I will write everything in an organized manner.


*

*Manipulate the expression using only 'proper' equalities (equailities that don't involve limits) and only then take the limit. For example:
$$ \frac{x+1}{x} = 1 + \frac{1}{x} \xrightarrow[x\rightarrow\infty]{} 1$$

*If we were to look at your example, we could essentially rewrite it similarly to what we did in point 1, without writing $\text{lim}$ so many times:
$$\frac{x}{x+1}=\frac{\frac{x}{x}}{\frac{x}{x}+\frac{1}{x}}\xrightarrow[x\rightarrow\infty]{}\frac{1}{1+0}={\frac{1}{1}}=1$$

*Write $\text{lim}$ without the subscript '$x→∞$' (but then you have to remember that $x$ tends to $∞$).

*Once you reach something of the form $\lim_{x\rightarrow \infty}\frac{1}{1+0}$ then it is widely accepted to just write it equates to $1$ (Without further explaining).

*Sometimes it is of great convinience to use O-notation. Use of that little-O would look like:
$$\frac{x+1}{x} = 1+ o(1)\quad(x\rightarrow\infty)  $$
And big-O:
$$ \frac{x+1}{x} =1+\mathcal{O}\left(\frac{1}{x}\right)\quad(x\rightarrow\infty) $$
Having brought the expression to a final form (which resembles the 2 latter equalities) one immediately recognizes the limit. This notation, usually, conceals some limiting procedure.


Of course, the above guidelines only suggest a way of having a cleaner, more compact paper, and are not of any mathematical importance. The basic rule is; the purpose of mathematical notations is to convey an ideas or objects. [I would say] As a rule of thumb: Notations are good if they are intuitive (and intuitevely understandable), neat and simple.
A: Apart from the long arrow notation, mentioned by others:
$$ f \xrightarrow[x\to\infty]{} g$$
I would recommend, in this specific problem, to use a new variable. Note that for
$$u = x+1$$
we have
$$\frac x{x+1} = \frac {u-1}u = 1-\frac 1u$$
hence
$$ \lim_{x\to\infty} \frac x{x+1} = \lim_{u\to\infty} \left(1-\frac 1u\right) = 1-0 = 1$$
