Some Properties and Distribution of the Zeros of the -Sigmoid Polynomials

Table 1

Approximate zeros of .

	and
	−1, −0.620721–0.0361286 i, −0.620721 + 0.0361286 i
	−0.60958–0.108614 i, −0.60958 + 0.108614 i, −0.588669–0.180732 i
	−0.588669 + 0.180732 i, −0.558909–0.250923 i, −0.558909 + 0.250923 i
	−0.520715–0.31767 i, −0.520715 + 0.31767 i, −0.474449–0.379636 i
	−0.474449 + 0.379636 i, −0.420612–0.435565 i, −0.420612 + 0.435565 i
	−0.359937–0.484249 i, −0.359937 + 0.484249 i, −0.222503–0.555698 i
	−0.222503 + 0.555698 i, −0.148551–0.577093 i −0.148551 + 0.577093 i
	−0.0730754–0.588612 i, −0.0730754 + 0.588612 i, −0.0137537
	0.00256565–0.590362 i, 0.00256565 + 0.590362 i, 0.0771461–0.58261 i
	0.0771461 + 0.58261 i, 0.14955–0.565738 i, 0.14955 + 0.565738 i
	0.218754–0.540216 i, 0.218754 + 0.540216 i, 0.283816–0.506599 i
	0.283816 + 0.506599 i, 0.343876–0.46552 i, 0.343876 + 0.46552 i
	0.398157–0.417686 i, 0.398157 + 0.417686 i, 0.445974–0.363867 i
	0.445974 + 0.363867 i, 0.486731–0.304893 i, 0.486731 + 0.304893 i
	0.519934–0.241641 i, 0.519934 + 0.241641 i, 0.545183–0.175026 i
	0.545183 + 0.175026 i, 0.562181–0.105989 i, 0.562181 + 0.105989 i
	0.570729–0.0354924 i, 0.570729 + 0.0354924 i