
[maths eulerEuler's identity] e^{i \pi} + 1 = 0[/maths] 
can be factorised as . 
$x^2  y^2$ can be factorised as $(xy)(x+y)$. 
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Reference to (Euler's identity) above. 
Reference to [eqref euler] above. 

[theorem ftbaFundamental theorem of basic arithmetic]Let $x = 2$. Then $x + x = 4$.[/theorem] 
By theorem [ref ftba], . 
By theorem [ref ftba], $x  2 = 0$. 
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The proof is obvious. Indeed, 2 + 2 = 4. 
[add]The proof is obvious.{{ Indeed, 2 + 2 = 4.}}[/add] 

[frame][lemma importantThe Important Lemma] $2 + 1 = 3$ [/lemma][/frame] 
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