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Cosmos Explorer

Heterotic Compactifications

String Theory

Frontier, 1985

Read about this theory

The three rings

Inner ring
The other variants of String Theory. A hollow square is historical or rejected.
Middle ring
The other families of Ch. 4, as their status shapes.
Outer ring
The other chapters. Those at the top are marked “Also answers this question”: this variant answers their question too.

The rings as lists