At: split factor2 char
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 {cases from its definition, the only work is showing that it factors the same {number as g {} SideProof  | 
| 1 | 
 2. g : {2..k 3. x : {2..k 4. y : {2..k 5. x 6. x<y 7. x<x 8. y<x 9. h : {2..k 10. h = split_factor2(g; x; y) 11. h(x 12. h(x) = g(x)+g(x 13. h(y) = g(y)+g(x 14.  | 11 steps | 
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