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[Henri Girard <address@hidden>]

Hi,
I have problem to def a class in sage, it's working in a sage notebook :

Sage]  class Obwod(object):
    def __init__(this, z):
        this.z = z

    def __add__(this, that):
        return Obwod(this.z + that.z)

    def __mul__(this, that):
        return Obwod(1/(1/this.z + 1/that.z))

Traceback (most recent call last):
  File "tm_sage", line 4
    def __add__(this, that):
                           ^
IndentationError: unindent does not match any outer indentation level
Any help ?
regards
Henri