Xah Talk Show 2021-07-21 emacs lisp xah-html-goto-matching-tag, WolframLang triple helix

• Write a emacs command that combines xah-html-skip-tag-backward xah-html-skip-tag-forward. Final code name xah-html-goto-matching-tag
• Predicate in Programing Languages and Naming
• Internet WIFI Speed Growth Rate
• Download Wolfram Language Free

parametric formula for helix.

x = Cos[t]
y = Sin[t]
z = t

Wolfram Language syntax:

{Cos[t], Sin[t], t}

syntactical equivalent ways to write a lambda:

• Function[t, {Cos[t], Sin[t], t}]
• Function[{t}, {Cos[t], Sin[t], t}]
• Function[ {Cos[#], Sin[#], #}]
• {Cos[#], Sin[#], #}&

Triple helix:

Graphics3D[{
Tube[ ({Cos[#], Sin[#], #}&) /@ Range[0, 9, 0.5], .2],
Tube[ ({Cos[#+ 2 Pi/3], Sin[# + 2 Pi/3], #}&) /@ Range[0, 9, 0.5], .2],
Tube[ ({Cos[#+ 2 Pi*2/3], Sin[# + 2 Pi*2/3], #}&) /@ Range[0, 9, 0.5], .2]
}]

xah_talk_show_2021-07-21.txt