[bpfk] BPFK Sections: VUhU4

[Gleki Arxokuna <gleki.is.my.name@gmail.com>]

http://mw.lojban.org/papri/BPFK_Section:_MEX_Operators#cmavo:_si.27i_.28VUhU4.29

li si'i ky. ky. vei no bi'o ny. du li pimu pi'i ny. pi'i vei ny. su'i pa

The sum of k from 0 to n is equal to 0.5 x n x ( n+1 )

Why {ky ky}? Mistype?

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