English: Plot of y=2^x and y=4^x, with line y=x+1. The line intersects the two graphs, respectively, for x>1 and x<1. The natural exponential function y=e^x is the unique exponential for which the two graphs intersect only at x=0.
Português: Gráfico de y = 2^x e y = 4^x, com a reta y = x + 1. A reta intersecta ambos os gráficos, respectivamente, para x > 1 e x < 1. A função y = e^x é a única função exponencial que os gráficos intersectam somente em x = 0.
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