Full text: Appeltauer, Ignatius: Elementorum matheseos purae pars prima continens algebram

321 
Formula. 
Data. 
Quaesita. 
4. 
) 
a, d, n 
20. 
3. 
a, d, 2 
16. 
n. 
19. 
a, dy s 
15. 
2. 
a, n. 2 
8. 
d 
18. 
d, n, s 
d 
14. 
a, 2, 5 
n 
6. 
1. 
d, n, 
12. 
0 
17. 
d, n, s 
II. 
13. 
d, 2, 5 
7 
10. 
5. 
Ny 25 5 
9. 
— 
— 
e . 
a terminum primum, d 
Designant autem: 
differentiam, n numerum terminorum, z ultimum 
terminum, et s summam progressionis arith 
meticae. 
De numeris figuratis. 
465. §. Numeri sequentes vocantur figura 
ti, quia totidem puncta, quot illi unitates com 
prehendunt, in figuras regulares, e. g. in trian 
gula, quadrata, pentagona etc. disponi possunt. 
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