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To define GAP functions in Sage, you can use the command libgap.eval(), as mentioned earlier. For example:

F = libgap.eval("myfunction := function(x, y) if x = y then return true; else return false; fi; end;")

This allows you to call F(x, y) in Sage as if it were a native function. However, it's important to note that if the GAP function myfunction contains any string, Sage will return an error. A way to work around this issue is to use the String function to handle strings properly.