BuboFlash - helps with learning

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随机过程的方差
For any random process

$X_{t}$ , the Varience is

$\operatorname{Var}[X_{t}]=\mathbf{E}[(X_{t}-\mathbf{E}[X_{t}])^{2}]$

status	not learned	measured difficulty	37% [default]	last interval [days]
repetition number in this series	0	memorised on		scheduled repetition
scheduled repetition interval		last repetition or drill

No repetitions

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