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22 lines
427 B
OCaml
22 lines
427 B
OCaml
(** Thresholds *)
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let epsilon = 2.e-15
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let integrals_cutoff = epsilon
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(** Mathematical constants *)
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let pi = acos (-1.)
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let two_pi = 2. *. pi
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let sq_pi = sqrt pi
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let sq_pi_over_two = sq_pi *. 0.5
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let pi_inv = 1. /. pi
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let two_over_sq_pi = 2. /. sq_pi
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(** Physical constants *)
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let a0 = 0.529_177_210_67
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let a0_inv = 1. /. a0
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let ha_to_ev = 27.211_386_02
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let ev_to_ha = 1. /. ha_to_ev
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