[isabelle] Monotonic operators and calculational reasoning

How does Isar's calculational reasoner handle montonic operators?

For example, in the following

  have "(1::nat) < 3"
    by (auto)
  also have "(3::nat) + 1 < 5"
    by (auto)

the result is

calculation: (!!x y. x < y ==> x + 1 < y + 1) ==> 1 + 1 < 5

how do I treat this unwanted premise? Declaring add_less_mono1 as a
trans rule has no effect. You can't resolve the calculation with
add_less_mono1. I am puzzled.

Dr Brendan Mahony
Information Networks Division                   ph +61 8 8259 6046
Defence Science and Technology Organisation     fx +61 8 8259 5589
Edinburgh, South Australia      Brendan.Mahony at dsto.defence.gov.au

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