User talk:Pengyulong7

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Please remember to sign your messages on talk pages by typing four tildes ( ~ ); this will automatically insert your username and the date. If you need help, check out Questions, ask me on my talk page, or, and a volunteer should respond shortly. Again, welcome! Curro2 (talk) 03:30, 25 January 2016 (UTC)

March 2016
Hello, I'm BracketBot. I have automatically detected that [//en.wikipedia.org/w/index.php?diff=708719073 your edit] to Quantum mechanics may have broken the syntax by modifying 1 "[]"s. If you have, don't worry: just [ edit the page] again to fix it. If I misunderstood what happened, or if you have any questions, you can leave a message on [//en.wikipedia.org/w/index.php?action=edit&preload=User:A930913/BBpreload&editintro=User:A930913/BBeditintro&minor=&title=User_talk:A930913&preloadtitle=BracketBot%20–%20&section=new my operator's talk page].
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 * Yellow is the incident wave, blue are reflected and transmitted waves, red does not occur. E V0 for this figure.]]
 * :$$V(x)= \begin{cases} 0, &amp; x 0, \\ V_0, &amp; x \ge 0. \end{cases} $$