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(* Micromega: A reflexive tactic using the Positivstellensatz *)
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(* Frédéric Besson (Irisa/Inria) 2006-2008 *)
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Require Import Ring_normalize.
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Lemma yplus_minus : forall x y,
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0 = x + y -> 0 = x -y -> 0 = x /\ 0 = y.
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(* Other (simple) examples *)
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Lemma binomial : forall x y, ((x+y)^2 = x^2 + 2 *x*y + y^2).
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Lemma hol_light19 : forall m n, 2 * m + n = (n + m) + m.
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Lemma vcgen_25 : forall
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(H0 : 1 * it + (-2%R ) * i + (-1%R ) = 0)
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(H : 1 * jt + (-2 ) * j + (-1 ) = 0)
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(H1 : 1 * n + (-10 ) = 0)
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(H2 : 0 <= (-4028 ) * i + (6222 ) * j + (705 ) * m + (-16674 ))
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(H3 : 0 <= (-418 ) * i + (651 ) * j + (94 ) * m + (-1866 ))
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(H4 : 0 <= (-209 ) * i + (302 ) * j + (47 ) * m + (-839 ))
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(H5 : 0 <= (-1 ) * i + 1 * j + (-1 ))
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(H6 : 0 <= (-1 ) * j + 1 * m + (0 ))
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(H7 : 0 <= (1 ) * j + (5 ) * m + (-27 ))
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(H8 : 0 <= (2 ) * j + (-1 ) * m + (2 ))
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(H9 : 0 <= (7 ) * j + (10 ) * m + (-74 ))
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(H10 : 0 <= (18 ) * j + (-139 ) * m + (1188 ))
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(H11 : 0 <= 1 * i + (0 ))
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(H13 : 0 <= (121 ) * i + (810 ) * j + (-7465 ) * m + (64350 )),
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(( 1 ) = (-2 ) * i + it).
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Goal forall x, -x^2 >= 0 -> x - 1 >= 0 -> False.
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Lemma motzkin' : forall x y, (x^2+y^2+1)*(x^2*y^4 + x^4*y^2 + 1 - (3 ) *x^2*y^2) >= 0.
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Lemma l1 : forall x y z : R, Rabs (x - z) <= Rabs (x - y) + Rabs (y - z).
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intros; split_Rabs; psatzl R.
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