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+title = "γ function"
+author = "Yann Herklotz"
+tags = []
+categories = []
+backlinks = ["2e1b2"]
+forwardlinks = ["2e1b4", "2e1b3a"]
+zettelid = "2e1b3"
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+
+This is an if-then-else function, which takes in a boolean predicate and
+picks one of the possible values from it. For example, the following:
+
+    x2 = γ(b, x1, x3)
+
+will pick either `x1` or `x3` based on the predicate value of `b`, where
+`b` is an expression.