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 +1,6 @@
+# Bessel function J_n(x) on the real line for n=0,1,2,3
+j0 = lambda x: besselj(0,x)
+j1 = lambda x: besselj(1,x)
+j2 = lambda x: besselj(2,x)
+j3 = lambda x: besselj(3,x)
+plot([j0,j1,j2,j3],[0,14])