Grumpy Cat RIP

Sad news from May 17, 2019, Grumpy cat is dead. The beloved cat actually had passed away the day before our final exam on, when the exams were already printed. But how do we know, it is really dead?

It definitely had been dead and alive during the exam, when you solved a problem:
Or when you dealt with the Grumpy cat graph:
Here is the obituary: