Origin of forward slash and backslash

A collection of short stories after work （ One ）

• Forward slash is “/” , The backslash is ""
• Why are these two called orthocline and anticline respectively ？
• Because in the mathematical concept of function , Univariate function y=ax (a > 0) The function image of is as follows
  
• Is a slash from bottom left to top right , take a Positive number , So this kind of slash is called forward slash
• conversely a<0 when , The slash is from top left to bottom right , Call it a backslash