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+title = "μ function"
+author = "Yann Herklotz"
+tags = []
+categories = []
+backlinks = ["2e1b5a", "2e1b1"]
+forwardlinks = ["2e1b3", "2e1b2a"]
+zettelid = "2e1b2"
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+
+The μ function only appears in loop headers, and it selects the initial
+and loop carried values for the variables in the loop. It does not come
+with a condition, and instead works exactly like a φ function, where the
+left hand value is the initial one, and the right hand value is the
+loop-carried value.
+
+    x2 = μ(x1, x3)
+
+Means that the initial value for x2 is x1, and that the consequent
+values for x2 is the value of x3.