1632-1704 1646-1716 1892-1918 1914-1918 aerialmilitaryoperations aerialoperations biografi biography criticismandinterpretation critiqueetinterprétation fighterpilots flygoperationer förstavärldskriget1914-1918 german germanaerialoperations germany god gottfriedwilhelm gottfriedwilhelmleibniz john leibniz locke manfredalbrecht metaphysics philosophie philosophy proof richthofen stridspiloter substance(philosophie) substance(philosophy) worldwar