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 @@
+# Modified Bessel function of 2nd kind K_n(x) on the real line for n=0,1,2,3
+k0 = lambda x: besselk(0,x)
+k1 = lambda x: besselk(1,x)
+k2 = lambda x: besselk(2,x)
+k3 = lambda x: besselk(3,x)
+plot([k0,k1,k2,k3],[0,8],[0,5])