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Step * of Lemma pi-positive

r0 < π
BY
{ (Unfold `pi` 0
   THEN (RWO  "int-rmul-req" 0 THENA Auto)
   THEN InstLemma `halfpi-positive` []
   THEN nRMul ⌜r(2)⌝ (-1)⋅
   THEN Auto) }

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Latex:

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Latex:
r0  <  \mpi{}


By

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Latex:
(Unfold  `pi`  0
  THEN  (RWO    "int-rmul-req"  0  THENA  Auto)
  THEN  InstLemma  `halfpi-positive`  []
  THEN  nRMul  \mkleeneopen{}r(2)\mkleeneclose{}  (-1)\mcdot{}
  THEN  Auto)

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