Timeline for Understanding the CDF of the Exponential from the PDF?

7 events

when toggle format	what		by	license	comment
May 6, 2016 at 13:59	vote	accept	Stephen
May 5, 2016 at 18:33	comment	added	whuber♦		Obviously $x\to\exp(-\lambda x)$ cannot be a CDF (even when limited to positive $x$), because either it decreases (for $\lambda \gt 0$), blows up (for $\lambda \lt 0$), or is forever constant, none of which are possible for any CDF (except an atom at $0$, which is unhelpful). Moreover, when you checked your work you should have found that $\frac{d}{dx}\exp(-\lambda x) = -\lambda\exp(-\lambda x)$ has the wrong sign.
May 5, 2016 at 16:44	history	edited	dsaxton	CC BY-SA 3.0	typesetting
May 5, 2016 at 16:41	history	edited	Greenparker	CC BY-SA 3.0	deleted 10 characters in body
May 5, 2016 at 14:56	answer	added	Greenparker		timeline score: 7
May 5, 2016 at 14:12	review	First posts
May 5, 2016 at 14:32
May 5, 2016 at 14:08	history	asked	Stephen	CC BY-SA 3.0