Non-realizability of a triple Massey product for the algebra ${\mathbb{F}}_2[a,b,c]/(ab,bc)$

Eivind Xu Djurhuus, Gereon Quick

We show that an often used example of a cohomology algebra with non-vanishing triple Massey product is intrinsically A_3-formal and therefore, in fact, cannot be realized as the co…