Following Kwankyu's instructions to preface it with a PR on 39571, my build
from source of Sage succeeded on my old MacBook Pro 9,2. Sage started up
and executed simple tests with the following error
*Possible bug wrt Safari*
The 2d test plot opened a Safari window and displayed the generated png
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I concur that it is just a moiré pattern and issues from sampling. Once you
get sufficiently far from the origin, the interval of r for frac(r^2) =
(0,1) gets very small (in fact, very quickly). Contrast this with
f(x,y) = frac(sqrt(x^2+y^2))
It comes down to the sampling being done to make the