Nearly all of them.
[math]2+2[/math] (seriously? A binary operation notated as an infix???) instead of [math]+ \ 2 \ 2[/math]
[math]\sum[/math] and [math]\prod[/math] (why not just use a big [math]+[/math] and [math]\times[/math]???)
[math]\frac{a}{b}[/math] (really? Division, out of the four standard ar...
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