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Isao Maruyama

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Unexpected result from DSolve? (Version dependence) 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)}} ... AUTHOR: Isao Maruyama 1724VIEWS 4REPLIES 9 months ago
COVID19 Tokyo per days of the week 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... AUTHOR: Isao Maruyama 10670VIEWS 3REPLIES 4 years ago
[NB] COVID-19 visualization of turning point 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... AUTHOR: Isao Maruyama 13463VIEWS 4REPLIES 5 years ago