An intuitive reasoning for 1+2+3+4+5..... + ∞ = -1/12?
4340
Why does $1+2+3+\cdots = -\frac{1}{12}$?
100896
What is the sum of this? $ 1 + \frac12 + \frac13 + \frac14 + \frac16 + \frac18 + \frac19 + \frac1{12} +\cdots$
155635
Why is the math for negative exponents so?
109365
Prove that 1/2 + 1/4 + 1/8 ....... = 1
122534
Show that $\sum (-1)^{n+1}/n$ = $k$ can be expanded to a sum with $ 1 - 1/2 + 1/3 + 1/5 - 1/4 +1/7 + 1/9 - 1/6 + ....$ which is $3k/2$
59619
What areas of physics depend on the sum $1 + 2 + 3 + 4 + 5 + 6+ 7+\ldots= -1/12$?
101512
Is there an numeric arithmetic with a single operator?
79170
$1 + \frac{1}{1+2}+ \frac{1}{1+2+3}+ ... + \frac{1}{1+2+3+...+n} = ?$
133905
Intuitive proof of $\sum_{k=1}^{n} \binom{n}{k} k^{k-1} (n-k)^{n-k} = n^n$
65648
Different ways to come up with $1+2+3+\cdots +n=\frac{n(n+1)}{2}$
54260
Int division: Why is the result of 1/3 == 0?
36951
How to evaluate the series $1+\frac34+\frac{3\cdot5}{4\cdot8}+\frac{3\cdot5\cdot7}{4\cdot8\cdot12}+\cdots$
57623
Does a +1/+1 counter remove a -1/-1 counter?
157001
Are there clever ways to evaluate this infinite series?
142715
Manipulating expression $(\frac{1}{4}+\frac{1}{2^{n+1}})(1-\frac{1}{2^{n+1}})$ in inductive step.
7066
Calculate simple expression: $\sqrt[3]{2 + \sqrt{5}} + \sqrt[3]{2 - \sqrt{5}}$
111705
Why does $\frac{1+t}{(1-t)^3}=\sum_{n=0}^{\infty}(1+n)^2t^n$