Math textbook disses computer scientists in the nerdiest way possible

Computer science concepts are often named after real-world equivalents. 
A queue, for instance, is a data structure where the first object in is the first object out, much like the functions of a real-word queueA stack, meanwhile, is last-in first-out, similar to how one would retrieve items from a stack without toppling it over.
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And then there's the tree. 
Instead of growing upwards like the trees you see o