Rebol languages aren't a particularly great choice for math.
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Operator precedence follows the left-to-right nature of the evaluator, not the precedence many would expect:
>> 1 + 2 * 3 == 9 -
Its syntax focus on words-separated-by-spaces, so this expands out expressions:
>> length of [x+y*z] == 1 >> type of first [x+y*z] == &[word] -
The language is interpreted, meaning that even the simplest operation like add 1 2 will run thousands of times slower than a compiled instruction.
But all programming involves math every now and again. So this category is for discussing any math issues people want to talk about.