Addition on the real numbers is commutative because for any real numbers s,t, it is true that s+t=t+s.
I've only one complaint about the book: the actual code is often poorly formatted and undercommented, so some of the examples are difficult to read.
I do not want to spend long in examining the arguments for this general deprecation of sense-perception or the intellectual motives for denying all credentials to sense-perception in order to enhance those of calculation, demonstration or religious faith. I want to get quickly to the much thornier briar-patch, the place, namely, where scientific accounts of perception seem to issue in the consequential doctrine that observers, including the physiologists and psychologists themselves, never perceive what they naïvely suppose themselves to perceive.
Set on a high base, with rich marble trim, it has leaded-glass windows on either side of the door, and a sophisticated arch above the central second-floor window. Mr. Palliser gave the Brush house a complex massing, with a rounded extension on the left and pedimented gables.
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