Is the Mac back or on its way out?

Apple recently held a big event in which it updated a number of its non-iPhone products, namely the MacBook Air, the Mac Mini, and the iPad Pro. 

For the first two, this update is the first in several years.  As Will Oremus points out in his take on the event, this fact cannot help but suggest that these devices are on their way out:

But for the Macs, it feels less like a golden age than the golden years.

What is a computer? Some more!

A recent posting pointed to some lack of clarity about what a computer is.  Is a computer anything that carries out automated, logical or arithmetical operations?  Or, is it a particular kind of good, e.g., a PC and not an iPad?

What is a computer?

What is a computer?  Wikipedia currently gives the following definition:

A computer is a device that can be instructed to carry out an arbitrary set of arithmetic or logical operations automatically.

This definition is one that might be expected from a computer scientist.  It is very broad and entirely functional, that is, it describes a computer strictly in terms of what it does.

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