https://mc-stan.org/math/structstan_1_1internal_1_1is__trivial__kg__expression_3_01math_1_1broadcast___3_01_t_00_01_colwise_00_01_rowwise_01_4_01_4.html
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https://mc-stan.org/math/classstan_1_1math_1_1rowwise__max___a0c14983df148e43616694bbfe009992c.html
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math librarystanrowwisemax