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Apologies if this is in the wrong place but I've no idea what *it* does.....

I should just mention that I'm currently doing my A-levels (16) and so my maths skills aren't that advanced....

The problem:

I've found a paper on the Kalman Filter on the internet (source: http://www.cs.unc.edu/~welch/media/pdf/kalman_intro.pdf)

Now, I'm trying to get my head around it, but am struggling with what the "'super minus'" means at the bottom of page 2.

I've asked all the teachers at school and none of them have any idea and keep telling me it's a typo and we've only dealt with indices that have a number in them.

Could someone here please explain what it means?

Cheers,

Michael