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$$E=mc^2$$

$$\sum_{i=1}^n a_i=0$$
$$\sum ^ {j-1}{k=0}{\widehat{\gamma} {kj} z k } $$

$$
\Gamma(z) = \int_0^\infty t^{z-1}e^{-t}dt,.
$$

st=>start: Start|past:>http://www.google.com[blank]
e=>end: End:>http://www.google.com
op1=>operation: My Operation|past
op2=>operation: Stuff|current
sub1=>subroutine: My Subroutine|invalid
cond=>condition: Yes
or No?|approved:>http://www.google.com
c2=>condition: Good idea|rejected
io=>inputoutput: catch something...|request

st->op1(right)->cond
cond(yes, right)->c2
cond(no)->sub1(left)->op1
c2(yes)->io->e
c2(no)->op2->e

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