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Bigreat Trigrand Destruxul is equal to (...((200![200(200)200(200)200(200)200])![200(200)200(200)200(200)200])![200(200)200(200)200(200)200]...)![200(200)200(200)200(200)200] (with Bigreat Bigrand Destruxul parentheses), using Hyperfactorial array notation. The term was coined by Lawrence Hollom.[1]

## Contents

### Etymology

The name of this number is based on Latin prefix "bi-" and the number "Great Trigrand Destruxul".

### Approximations

Notation Approximation
Bird's array notation $$\{200,5,202[1[1\neg202]200[1\neg202]200[1\neg202]200]2\}$$
Hierarchical Hyper-Nested Array Notation $$\{200,5,202[1[1/201\sim2]200[1/201\sim2]200[1/201\sim2]200]2\}$$
Fast-growing hierarchy $$f_{\theta(\Omega^{200},\theta(\Omega^{200}2,\theta(\Omega^{200}3,198)+199)+199)+200}^3 \\ (f_{\theta(\Omega^{200},\theta(\Omega^{200}2,\theta(\Omega^{200}3,198)+199)+199)+199}(200))$$
Hardy hierarchy $$H_{\theta(\Omega^{200},\theta(\Omega^{200}2,\theta(\Omega^{200}3,198)+199)+199)\times(\omega^{200}3+\omega^{199})}(200)$$
Slow-growing hierarchy $$g_{\vartheta(\Omega_2^{200}3+\theta_1(\Omega_2^{200},\theta_1(\Omega_2^{200}2,\theta_1(\Omega_2^{200}3,198)+199)+199)+201)}(4)$$