I went to  (deleted, so 10K+ only) and pressed the "undelete" link. As you can see in the following screenshots, there are discrepancies in what it tells me about how many votes are needed to undelete the post.  First, it says 1 more vote is needed.    Then it says there are 22 votes remaining. I am not sure if this is supposed to be the number of undelete votes I have left or the number of votes still required to undelete the post.    Apparently, even though earlier my vote was the only one needed to undelete the post, now yet another vote is required. (Also note the minor pluralization bug; it reads better as "1 more vote from another user" instead of "1 more vote from other users".)    What's going on here? How many undelete votes would this question actually need to be undeleted?    Side note: I don't really care much about whether or not this post should be undeleted; I clicked through just to document the discrepancy.
Normally, it takes three votes to delete.  It still does, though the mouseover tip for a question with one delete vote cast on it already appears to be stuck at '1'    And then after casting a delete vote on it:    And if I've cast the first delete vote:    The above examples are from P.SE, and while I don't have the privs to verify this being the situation on other sites, this has been confirmed on at least SO and is likely network wide.    Child meta dups:   SO:
The following is exercise 8.2 in 3rd edition (and exercise 8.19 in 2nd edition) of Goldstein's Classical Mechanics.   Adding the total time derivative of a function of $q_i$ and t to the Lagrangian will not change the the Euler-Lagrangian equation. So if we make the following change to Lagrangian,   $$L'(q,\dot{q},t) = L(q,\dot{q},t) + \frac{dF(q_1,q_2,...,q_n,t)}{dt}$$ we can get  $$ \frac{d}{dt}\frac{\partial{L'}}{\partial{\dot{q_i}}} - \frac{\partial{L'}}{\partial{q_i}} = 0 $$ from  $$ \frac{d}{dt}\frac{\partial{L}}{\partial{\dot{q_i}}} - \frac{\partial{L}}{\partial{q_i}} = 0 $$  How can we get the corresponding Hamiltonian equation part? This is to prove  $$ \dot{p'_i} = \frac{\partial{H'}}{\partial q_i} $$ $$ -\dot{q_i} = \frac{\partial{H'}}{\partial p'_i}  $$  from   $$ \dot{p_i} = \frac{\partial{H}}{\partial q_i} $$ $$ -\dot{q_i} = \frac{\partial{H}}{\partial p_i}  $$ where $p'_i = \frac{\partial L'}{\partial \dot q_i}$.  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