chore: import upstream snapshot with attribution

2026-07-13 12:32:53 +08:00
commit 2a16f2f53b
247 changed files with 69150 additions and 0 deletions
@@ -0,0 +1,7 @@
+# Chebyshev polynomials U_n(x) on [-1,1] for n=0,1,2,3,4
+f0 = lambda x: chebyu(0,x)
+f1 = lambda x: chebyu(1,x)
+f2 = lambda x: chebyu(2,x)
+f3 = lambda x: chebyu(3,x)
+f4 = lambda x: chebyu(4,x)
+plot([f0,f1,f2,f3,f4],[-1,1])