00861nam0-22002891i-450-990001191540403321000119154FED01000119154(Aleph)000119154FED0100011915420000920d1933----km-y0itay50------bagerMethodik der Mathematischen UnterrichtsW. LietzmannLeipzigVerlag von Quelle & Meyer1933Handbuch des naturwissenschaftlichen und mathematischen Unterrichts7-2MatematicaDidattica - metodologie510.07Lietzmann,W.56143ITUNINARICAUNIMARCBK9900011915404033218-E-281279MA1MA100A35Methodik der Mathematischen Unterrichts341209UNINAING0101975nam--2200397---450-99000580133020331620130703095330.0978-92-897-1073-2000580133USA01000580133(ALEPH)000580133USA0100058013320130129d2012----km-y0itaa50------baengLU||||||||001yyIntergenerational solidarityEuropean Foundation for the Improvement of living and working conditionsLuxembourgPublications office of the European Union201223 p.ill.25 cmFoundation findingsPopulation ageing is often viewed as an impending threat to the economic and social stability of post-industrial societies. Forecasters expect people aged 65 and over to make up 30% of the European Union population by 2060 – almost double today’s figure of 17%. At the same time, the working age population (aged 15–64 years) peaked in 2010 at 67% and is predicted to decline steadily to 59% by 2060. The upshot of the demographic shift is that social protection systems may become unsustainable as the demands upon them intensify while the number of net contributors declines. [Ed.]2001Foundation findingsEuropaPopolazioneInvecchiamentoBNCF331.394094111914.01Invecchiamento della popolazioneFondazione europea per il miglioramento delle condizioni di vita e di lavoro414560ITsalbcISBDhttp://bookshop.europa.eu/uri?target=EUB:NOTICE:TJFF12011:EN:HTML.Accesso libero online990005801330203316CDE 14.01 (VI)CDE 2911CDE 14.0100185178BKCDEMARIAS9020130129USA011020MARIAS9020130703USA010953Intergenerational solidarity1080574UNISA