Understanding the maths notation

Hi there,

I found this maths notation and I don't understand the meaning of semicolon or dot in it. Any help would be greatly appreciated.

Please see attached image.

Regards,
Zizi
maths..JPG
zizi21Asked:
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d-glitchCommented:
It looks like some sort of functional or programming notation.
What is the context?   Where did you see it?
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zizi21Author Commented:
I saw it on the paper. It was in an imaging paper. I have attached more part of the formula. Could you please take a look at it.
imagingmath.JPG
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d-glitchCommented:
There is an explanation here:    http://en.wikipedia.org/wiki/Scale_space

But I can't claim to understand it entirely.
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zizi21Author Commented:
Thanks a lot. I would study it now.
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zizi21Author Commented:
Thanks a lot for your help. I would continue to read the article.
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