3 Masterpieces of Late Twentieth-Century Design Theory

1:  Rossi's Inequality, aka the Architectural Memory Theorem

The minimum meaningful architectural configuration is greater than and irreducible to its geometric constituents.

2:  Hejduk's Inequality, aka the Architectural Poetry Theorem

The minimum poetic architectural configuration is greater than and irreducible to architectural memories.

3:  Eisenmann's Hypothesis, aka the Architectural Calculus Theorem

Minimum geometric, mnemonic and poetic configurations are special cases of a generalized calculus of form.

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Text and images from Jeffrey Kipnis, Late Twentieth Century Design Theory, 1990
via Architecture's Desire, Reading the Late Avant-Garde, K. Michael Hays. MIT Press.