This code computes a numerical approximation to the quantum field theory of a 2-d massive scalar field with phi^4 interaction.
The analysis makes use of Sage (http://www.sagemath.org), I'm assuming that you have it installed and it can be called with "sage" on the command line.w
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Download this code.
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Compile inside the Sage shell:
sage -sh -c make
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Start Sage and
import phi4. Or, for a more elaborate example:sage: load('phase_plot.py')