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 @@
+# Kelvin functions ker_n(x) and kei_n(x) on the real line for n=0,2
+f0 = lambda x: ker(0,x)
+f1 = lambda x: kei(0,x)
+f2 = lambda x: ker(2,x)
+f3 = lambda x: kei(2,x)
+plot([f0,f1,f2,f3],[0,5],[-1,4])