yoyostein
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 Nov 26 comment Homology of hexagon I mean for parts (2), (3), (4). Nov 25 awarded Popular Question Nov 25 revised Mathematicians who overcame academic failure to achieve success added 8 characters in body Nov 25 revised Simplicial Approximation Concrete Diagram (Experts needed) edited title Nov 25 asked Simplicial Approximation Concrete Diagram (Experts needed) Nov 25 revised Mathematicians who overcame academic failure to achieve success added 167 characters in body Nov 25 revised Mathematicians who overcame academic failure to achieve success added 420 characters in body; edited title; added 2 characters in body; added 10 characters in body Nov 25 comment Mathematicians who overcame academic failure to achieve success Interesting! I learnt something new from your answer. +1 Nov 25 comment Mathematicians who overcame academic failure to achieve success @Chinny84 My decision (accepted answer) is not final, it can change if I see a better answer. Do keep the answers coming! Nov 24 awarded Nice Question Nov 24 revised Mathematicians who overcame academic failure to achieve success edited tags Nov 24 asked Mathematicians who overcame academic failure to achieve success Nov 23 comment The transformation of $\frac{\partial y}{\partial x}=\frac{Q}{P}$ to $\frac{dy}{Q}=\frac{dx}{P}$ @NormalHuman wow I am surprised a bot can say this. +1 Nov 22 comment Homology of hexagon With your hints, I managed to get $H_0=\mathbb{Z}$, $H_1=\mathbb{Z}\oplus\mathbb{Z}\oplus\mathbb{Z}$, $H_2=0$. Not sure if it is correct.. Nov 21 awarded Nice Question Nov 21 comment Open set U whose outer measure is less than A + epsilon Thanks this is very helpful Nov 21 accepted Open set U whose outer measure is less than A + epsilon Nov 21 asked Open set U whose outer measure is less than A + epsilon Nov 20 comment Show G has a normal subgroup of a given index Nice and succinct answer Nov 19 asked Delta-complex structure on S^2