Spencer Unger

activity

20152026

most citedBorel Circle Squaring

17 citations · 39 across the 7 of their papers we have counts for

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Showing 2026Show all

2 papers · 1 filter

math.LO2026

Condensed Whitehead Problem

Spencer Unger, Jerry Wei

The Whitehead problem, which asks whether every abelian group $A$ satisfying $Ext^{1} (A, Z) = 0$ is free, is independent of ZFC. However, this problem has an analogu…

math.LO2026

$G_{δ}$ Circle Squaring

Spencer Unger, Narmada Varadarajan, Felix Weilacher

We show that a circle and square of the same area in $R^{2}$ are equidecomposable by translations using $Δ_{2}^{0}$ pieces. That is, pieces which are simultaneously $F_{σ}$ …

Condensed Whitehead Problem

Gδ​ Circle Squaring

$G_{δ}$ Circle Squaring