remove unnecessary Require statements in model.task.preemption

restructuring/model/task/preemption/floating_nonpreemptive.v

 Require Import rt.restructuring.model.preemption.limited_preemptive.
 Require Export rt.restructuring.model.task.preemption.parameters.
 
-From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq fintype bigop.
-
 (** * Platform for Models with Floating Non-Preemptive Regions *)
 (** In this section, we introduce a set of requirements for function
     [task_max_nonpr_segment], so it is coherent with model with

restructuring/model/task/preemption/fully_nonpreemptive.v

 Require Export rt.restructuring.model.task.preemption.parameters.
 
-From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq fintype bigop.
-
 (** * Platform for Fully Non-Preemptive Model *)
 (** In this section, we instantiate function
    [task_max_nonpreemptive_segment] for the fully non-preemptive
@@ -22,9 +20,6 @@ Section FullyNonPreemptiveModel.
                                                      
 End FullyNonPreemptiveModel.
 
-
-From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq fintype bigop.
-
 (** * Task's Run to Completion Threshold *)
 (** In this section, we instantiate function [task run to completion
     threshold] for the fully non-preemptive model. *)

restructuring/model/task/preemption/fully_preemptive.v

@@ -17,8 +17,6 @@ Section FullyPreemptiveModel.
   
 End FullyPreemptiveModel.
 
-Require Export rt.restructuring.model.task.preemption.parameters.
-
 (** * Task's Run to Completion Threshold *)
 (** In this section, we instantiate function [task run to completion
    threshold] for the fully preemptive model. *)

restructuring/model/task/preemption/limited_preemptive.v

 Require Export rt.restructuring.model.task.preemption.parameters.
 Require Import rt.restructuring.model.preemption.limited_preemptive.
-From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq fintype bigop.
 
 (** * Platform for Models with Limited Preemptions *)
 (** In this section, we introduce a set of requirements for function