requirement that one include all the histories

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GoodTaste

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The predications of QED have been tested and found to match experimental results with great precision. But performing the mathematical calculations required by QED can be difficult. The problem, as we'll see below, is that when you add to the above framework of particle exchange the quantum requirement that one include all the histories by which an interaction can occur-for example, all the ways the force particles can be exchanged-the mathematics becomes complicated.

Source: The Grand Design by Stephen Hawking

The author uses "include" rather than "includes" after the subject "one" seems to indicate that the grammar is imperative (that is, it actually means "one should include"). I am not sure.
What is the grammar for "one include" instead of "one includes"?
 
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