Ghlen Livid added Inverse_is_also_true_if__.tex  almost 8 years ago

Commit id: 62f5d70985544eccff09b6e807d0c61a4521ec69

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Inverse is also true, if we assume that  $$ \vec{v}(t) = \frac{\vec{x}(t+\Delta t) - \vec{x}(t-\Delta t)}{2 \Delta t} $$