--- /dev/null
+(**************************************************************************)
+(* ___ *)
+(* ||M|| *)
+(* ||A|| A project by Andrea Asperti *)
+(* ||T|| *)
+(* ||I|| Developers: *)
+(* ||T|| The HELM team. *)
+(* ||A|| http://helm.cs.unibo.it *)
+(* \ / *)
+(* \ / This file is distributed under the terms of the *)
+(* v GNU General Public License Version 2 *)
+(* *)
+(**************************************************************************)
+
+(* This file was automatically generated: do not edit *********************)
+
+set "baseuri" "cic:/matita/CoRN-Decl/reals/NRootIR".
+
+include "CoRN.ma".
+
+(* $Id: NRootIR.v,v 1.5 2004/04/23 10:01:05 lcf Exp $ *)
+
+(*#* printing NRoot %\ensuremath{\sqrt[n]{\cdot}}% *)
+
+(*#* printing sqrt %\ensuremath{\sqrt{\cdot}}% *)
+
+include "reals/OddPolyRootIR.ma".
+
+(*#* * Roots of Real Numbers *)
+
+(* UNEXPORTED
+Section NRoot
+*)
+
+(*#* ** Existence of roots
+
+%\begin{convention}% Let [n] be a natural number and [c] a nonnegative real.
+[p] is the auxiliary polynomial [_X_[^]n[-] (_C_ c)].
+%\end{convention}%
+*)
+
+alias id "n" = "cic:/CoRN/reals/NRootIR/NRoot/n.var".
+
+alias id "n_pos" = "cic:/CoRN/reals/NRootIR/NRoot/n_pos.var".
+
+alias id "c" = "cic:/CoRN/reals/NRootIR/NRoot/c.var".
+
+alias id "c_nonneg" = "cic:/CoRN/reals/NRootIR/NRoot/c_nonneg.var".
+
+(* begin hide *)
+
+inline "cic:/CoRN/reals/NRootIR/NRoot/p.con" "NRoot__".
+
+(* end hide *)
+
+inline "cic:/CoRN/reals/NRootIR/CnrootIR.con".
+
+(* UNEXPORTED
+End NRoot
+*)
+
+(*#* We define the root of order [n] for any nonnegative real number and
+prove its main properties:
+ - $\left(\sqrt[n]x\right)^n=x$#(sqrt(n) x)^n =x#;
+ - $0\leq\sqrt[n]x$#0≤sqrt(n)x#;
+ - if [Zero [<] x] then $0<\sqrt[n]x$#0<sqrt(n)x#;
+ - $\sqrt[n]{x^n}=x$#sqrt(n) x^n =x#;
+ - the nth root is monotonous;
+ - in particular, if [x [<] One] then $\sqrt[n]x<1$#sqrt(n) x<1#.
+
+[(nroot ??)] will be written as [NRoot].
+*)
+
+(* UNEXPORTED
+Section Nth_Root
+*)
+
+inline "cic:/CoRN/reals/NRootIR/nroot.con".
+
+inline "cic:/CoRN/reals/NRootIR/NRoot.con".
+
+inline "cic:/CoRN/reals/NRootIR/NRoot_power.con".
+
+(* UNEXPORTED
+Hint Resolve NRoot_power: algebra.
+*)
+
+inline "cic:/CoRN/reals/NRootIR/NRoot_nonneg.con".
+
+inline "cic:/CoRN/reals/NRootIR/NRoot_pos.con".
+
+inline "cic:/CoRN/reals/NRootIR/NRoot_power'.con".
+
+inline "cic:/CoRN/reals/NRootIR/NRoot_pres_less.con".
+
+inline "cic:/CoRN/reals/NRootIR/NRoot_less_one.con".
+
+inline "cic:/CoRN/reals/NRootIR/NRoot_cancel.con".
+
+(*#* %\begin{convention}% Let [x,y] be nonnegative real numbers.
+%\end{convention}% *)
+
+alias id "x" = "cic:/CoRN/reals/NRootIR/Nth_Root/x.var".
+
+alias id "y" = "cic:/CoRN/reals/NRootIR/Nth_Root/y.var".
+
+alias id "Hx" = "cic:/CoRN/reals/NRootIR/Nth_Root/Hx.var".
+
+alias id "Hy" = "cic:/CoRN/reals/NRootIR/Nth_Root/Hy.var".
+
+inline "cic:/CoRN/reals/NRootIR/NRoot_wd.con".
+
+inline "cic:/CoRN/reals/NRootIR/NRoot_unique.con".
+
+(* UNEXPORTED
+End Nth_Root
+*)
+
+(* UNEXPORTED
+Implicit Arguments NRoot [x n].
+*)
+
+(* UNEXPORTED
+Hint Resolve NRoot_power NRoot_power': algebra.
+*)
+
+inline "cic:/CoRN/reals/NRootIR/NRoot_resp_leEq.con".
+
+(*#**********************************)
+
+(* UNEXPORTED
+Section Square_root
+*)
+
+(*#**********************************)
+
+(*#* ** Square root *)
+
+inline "cic:/CoRN/reals/NRootIR/sqrt.con".
+
+inline "cic:/CoRN/reals/NRootIR/sqrt_sqr.con".
+
+(* UNEXPORTED
+Hint Resolve sqrt_sqr: algebra.
+*)
+
+inline "cic:/CoRN/reals/NRootIR/sqrt_nonneg.con".
+
+inline "cic:/CoRN/reals/NRootIR/sqrt_wd.con".
+
+(* UNEXPORTED
+Hint Resolve sqrt_wd: algebra_c.
+*)
+
+inline "cic:/CoRN/reals/NRootIR/sqrt_to_nonneg.con".
+
+inline "cic:/CoRN/reals/NRootIR/sqrt_to_nonpos.con".
+
+inline "cic:/CoRN/reals/NRootIR/sqrt_mult.con".
+
+(* UNEXPORTED
+Hint Resolve sqrt_mult: algebra.
+*)
+
+inline "cic:/CoRN/reals/NRootIR/sqrt_mult_wd.con".
+
+inline "cic:/CoRN/reals/NRootIR/sqrt_less.con".
+
+inline "cic:/CoRN/reals/NRootIR/sqrt_less'.con".
+
+inline "cic:/CoRN/reals/NRootIR/sqrt_resp_leEq.con".
+
+inline "cic:/CoRN/reals/NRootIR/sqrt_resp_less.con".
+
+(* UNEXPORTED
+End Square_root
+*)
+
+(* UNEXPORTED
+Hint Resolve sqrt_wd: algebra_c.
+*)
+
+(* UNEXPORTED
+Hint Resolve sqrt_sqr sqrt_mult: algebra.
+*)
+
+(* UNEXPORTED
+Section Absolute_Props
+*)
+
+(*#* ** More on absolute value
+
+With the help of square roots, we can prove some more properties of absolute
+values in [IR].
+*)
+
+inline "cic:/CoRN/reals/NRootIR/AbsIR_sqrt_sqr.con".
+
+(* UNEXPORTED
+Hint Resolve AbsIR_sqrt_sqr: algebra.
+*)
+
+inline "cic:/CoRN/reals/NRootIR/AbsIR_resp_mult.con".
+
+inline "cic:/CoRN/reals/NRootIR/AbsIR_mult_pos.con".
+
+inline "cic:/CoRN/reals/NRootIR/AbsIR_mult_pos'.con".
+
+inline "cic:/CoRN/reals/NRootIR/AbsIR_nexp.con".
+
+inline "cic:/CoRN/reals/NRootIR/AbsIR_nexp_op.con".
+
+inline "cic:/CoRN/reals/NRootIR/AbsIR_less_square.con".
+
+inline "cic:/CoRN/reals/NRootIR/AbsIR_leEq_square.con".
+
+inline "cic:/CoRN/reals/NRootIR/AbsIR_division.con".
+
+(*#* Some special cases. *)
+
+inline "cic:/CoRN/reals/NRootIR/AbsIR_recip.con".
+
+inline "cic:/CoRN/reals/NRootIR/AbsIR_div_two.con".
+
+(*#* Cauchy-Schwartz for IR and variants on that subject. *)
+
+inline "cic:/CoRN/reals/NRootIR/triangle_IR.con".
+
+inline "cic:/CoRN/reals/NRootIR/triangle_SumIR.con".
+
+inline "cic:/CoRN/reals/NRootIR/triangle_IR_minus.con".
+
+inline "cic:/CoRN/reals/NRootIR/weird_triangleIR.con".
+
+inline "cic:/CoRN/reals/NRootIR/triangle_IR_minus'.con".
+
+inline "cic:/CoRN/reals/NRootIR/triangle_SumxIR.con".
+
+inline "cic:/CoRN/reals/NRootIR/triangle_Sum2IR.con".
+
+inline "cic:/CoRN/reals/NRootIR/AbsIR_str_bnd_AbsIR.con".
+
+inline "cic:/CoRN/reals/NRootIR/AbsIR_bnd_AbsIR.con".
+
+(* UNEXPORTED
+End Absolute_Props
+*)
+
+(* UNEXPORTED
+Section Consequences
+*)
+
+(*#* **Cauchy sequences
+
+With these results, we can also prove that the sequence of reciprocals of a
+Cauchy sequence that is never zero and whose Limit is not zero is also a
+Cauchy sequence.
+*)
+
+inline "cic:/CoRN/reals/NRootIR/Cauchy_Lim_recip.con".
+
+inline "cic:/CoRN/reals/NRootIR/Cauchy_recip.con".
+
+inline "cic:/CoRN/reals/NRootIR/Lim_recip.con".
+
+(* UNEXPORTED
+End Consequences
+*)
+
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