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        Summary 
        World lines and world sheet - for the 'String theory' artic
        Los dos dibujos son planos . Pintarme la teoria de las cuerdas en 3, 4 dimensiones. Volvemos a lo mismo de siempre, la fatal pregunta, ¿por qué es como lo habeís dibujado?.
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          This work has been released into the  public domain by its author,  Maxim Razin at the  English Wikipedia project. This applies worldwide.
 In case this is not legally possible:  Maxim Razin grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. 
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