1. 0-const_func/
2. 1-pow_func/
3. 2-exp_func/
4. 3-log_func/
5. 4-tri_func/
6. 5-inv_tri_func/
7. 6-hyperbolic_func/
8. 7-inv_hyperbolic_func/
9. bas_ele_func.md
10. ele_func.md