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| Recently, I found that Google Copilot can solve a nonlinear but solvable equation like coulomb damping[1], just by searching for "r''(t)=-r(t)-sgn(r'(t))/10, r(0)=0, r'(0)=1" [2], whether Copilot's time-dependent answer is correct or not aside. Is... |
| Could you help me to understand the following? In[1]:= $VersionNumber Out[1]= 14. In[2]:= DSolve[{2.3*r''[t]==1-r'[t],r[0]==0,r'[0]==0},r[t],t]//FullSimplify Out[2]= {{r[t] -> -2. + 2.3 E^(-0.434783 t)}} ... |
| *MODERATOR NOTE: coronavirus resources & updates:* https://wolfr.am/coronavirus ---------- ![enter image description here][1] Seven curves represent number of confirmed COVID-19 cases in each day of the week through the year 2020, with top... |
| *MODERATOR NOTE: coronavirus resources & updates:* https://wolfr.am/coronavirus ---------- "Turning point(TP)" in the fight against COVID19 has been arriving at China and other states in a stabilizing trend. In this article, we... |