```moochan です．

Interval クラスの最新版を添付します． # 何度もすみません^^;;;

--- interval.rb.org	Thu Mar 11 15:53:03 1999
+++ interval.rb	Thu Mar 11 17:24:30 1999
@@ -2,7 +2,7 @@

class Interval
def initialize(beginning,ending,step=1)
-    reset!(beginning,ending,step)
+    reset(beginning,ending,step)
end
def reset(beginning,ending,step=1)
@begin, @end, @step = beginning, ending, step
@@ -52,14 +52,12 @@
yield clause(n)
end
end
-  def reverse
-    return set.reverse!
-  end
+  def reverse() return set.reverse!  end
def maximum(a,b) return a if a > b; return b end
private :maximum
def prime
ary = [2]
-    for i in 3..Math.sqrt(maximum(max,min))
+    for i in 3..Math.sqrt(maximum(max.abs,min.abs))
for j in ary
if j > Math.sqrt(i)
ary.push(i)

---
moochan

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