Solves the system of ODEs in Fig. 1.
Shows the graphical result.
• (Wikipedia) PHP (from Personal Home Page)
• CISTI'2026, 20th Iberian Conference on Information Systems and Technologies", 17–19 June 2026, Sevilla (Spain), to be confirmed.
• 1891-03-18: Shewhart, Walter ANdrew (†1967-03-11, 75 yrs.).