In reply to @DavidKButlerUoA

@DavidKButlerUoA Here's what I think is an OK proof. It took me a bit of thinking, and you'll note this is a day after I first saw your tweet! But I don't think it's obtuse. I can remember seeing a problem like this in the past that made thinking in vectors 'click' for me.…

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In reply to @christianp

@DavidKButlerUoA I can't immediately think of a way of proving it without vectors, by the way. It's just what you're familiar with, I reckon

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