c;28 x^6-1992 x^5 y-28 x^5+109884 x^4 y^2+4056 x^4 y+35 x^4+318208 x^3 y^3+21316 x^3 y^2-202 x^3 y-14 x^3-594688 x^2 y^4-629248 x^2 y^3-22389 x^2 y^2+88 x^2 y+7 x^2+917504 x y^5-549376 x y^4-21504 x y^3+2146 x y^2+70 x y-70320128 y^6-18350…

c;16 x^8+889 x^6 y^2-1080 x^6 y-16 x^6-1179 x^4 y^4 -3240 x^4 y^3-873 x^4 y^2+5400 x^4 y-1836 x^2 y^6 -3240 x^2 y^5+2052 x^2 y^4+10800 x^2 y^3-7776 x^2 y +216 y^8-1080 y^7-216 y^6+5400 y^5-7776 y^3+3456 y=0 c を描き,其の双対曲線 c^★;f^★(x,…