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src/HOL/Library/Float.thy
changeset 35032 7efe662e41b4
parent 33555 a0a8a40385a2
child 35344 e0b46cd72414
equal deleted inserted replaced
35028:108662d50512 35032:7efe662e41b4 
     4 *)
 
     4 *)
 
     5 
     5 
     6 header {* Floating-Point Numbers *}
 
     6 header {* Floating-Point Numbers *}
 
     7 
     7 
     8 theory Float
 
     8 theory Float
 
     9 imports Complex_Main
 
     9 imports Complex_Main Lattice_Algebras
 
    10 begin
 
    10 begin
 
    11 
    11 
    12 definition
 
    12 definition
 
    13   pow2 :: "int \<Rightarrow> real" where
 
    13   pow2 :: "int \<Rightarrow> real" where
 
    14   [simp]: "pow2 a = (if (0 <= a) then (2^(nat a)) else (inverse (2^(nat (-a)))))"
 
    14   [simp]: "pow2 a = (if (0 <= a) then (2^(nat a)) else (inverse (2^(nat (-a)))))"
isabelle