e

e = 2.7182818284 5904523536 0287471352 6624977572 4709369995 9574966967 6277240766 3035354759 4571382178 5251664274 ...

$\[e = \lim<sub$ n \to 0(1 + n)^1/n\]", title="\[e = \lim_{n \to 0}(1 + n)^1/n\]" /> or equivalently
$\[e = \lim<sub$ n \to \infty(1 + \frac{1}{n})^n\]", title="\[e = \lim_{n \to \infty}(1 + \frac{1}{n})^n\]" />

$\[e = \sum<sub$ n=0^\infty \frac{1}{k!}\]", title="\[e = \sum_n=0^\infty \frac{1}{k!}\]" />