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[maths euler|Euler's identity] e^{i \pi} + 1 = 0[/maths]
x^2 - y^2 can be factorised as (x-y)(x+y). $x^2 - y^2$ can be factorised as $(x-y)(x+y)$.
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Link to Wikipedia article on mathematics. Link to [[w:Mathematics|Wikipedia article on mathematics]].
External link to Google search results. External link to [ Google search results].
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Reference to (Euler's identity) above. Reference to [eqref euler] above.
[theorem ftba|Fundamental theorem of basic arithmetic]Let $x = 2$. Then $x + x = 4$.[/theorem]
By theorem [ref ftba], x - 2 = 0. By theorem [ref ftba], $x - 2 = 0$.

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Indeed, 2 + 2 = 4. <add text="The proof is obvious."> Indeed, 2 + 2 = 4.</add>
[frame][lemma important|The Important Lemma] $2 + 1 = 3$ [/lemma][/frame]
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