basis_2D: THEORY
%------------------------------------------------------------------------------
% Orthonormal Basis for 2D Vectors 3-4-2010
%
% Authors: Anthony Narkawicz NASA Langley
% Ricky Butler NASA Langley
%------------------------------------------------------------------------------
BEGIN
IMPORTING vectors_2D
e1,e2 : VAR Vect2
w,w1,w2: VAR Vect2
a1,a2,b1,b2 : VAR real
orthogonal_basis: LEMMA
e1 /= zero AND
e2 /= zero AND
orthogonal?(e1,e2) IMPLIES
w = ((w*e1)/sqv(e1))*e1 + ((w*e2)/sqv(e2))*e2
orthonormal?(e1,e2): bool =
orthogonal?(e1,e2) AND e1 /= zero AND norm(e1) = 1 AND
e2 /= zero AND norm(e2) = 1
orthonormal_basis: LEMMA FORALL (w:Vect2):
orthonormal?(e1,e2) IMPLIES
w = (w*e1)*e1 + (w*e2)*e2
basis_two_dot_zero: LEMMA
w /= zero AND e1 /= zero AND w*e1 = 0 AND w*e2 = 0
IMPLIES
(EXISTS (c:real): c*e1 = e2)
basis_add: LEMMA
%% orthonormal?(e1,e2) AND
w1 = (w1*e1)*e1 + (w1*e2)*e2 AND
w2 = (w2*e1)*e1 + (w2*e2)*e2
IMPLIES
w1+w2 = ((w1+w2)*e1)*e1 + ((w1+w2)*e2)*e2
basis_sub: LEMMA
%% orthonormal?(e1,e2) AND
w1 = (w1*e1)*e1 + (w1*e2)*e2 AND
w2 = (w2*e1)*e1 + (w2*e2)*e2
IMPLIES
w1-w2 = ((w1-w2)*e1)*e1 + ((w1-w2)*e2)*e2
basis_sqv: LEMMA FORALL (a,b: real,w: Vect2):
orthonormal?(e1,e2) AND
w = (a)*e1 + (b)*e2
IMPLIES
sqv(w) = sq(a) + sq(b)
basis_dot: LEMMA FORALL (a,b,c,d: real):
orthonormal?(e1,e2) IMPLIES
LET s = (a)*e1 + (b)*e2,
v = (c)*e1 + (d)*e2
IN
s*v = a*c + b*d
IMPORTING perpendicular_2D
basis_perpR: LEMMA FORALL (a,b: real):
LET e2 = perpR(e1),
s = (a)*e1 + (b)*e2
IN
perpR(s) = (a)*e2 - b*e1
vh_vp_orthon: LEMMA FORALL (v: Nz_vect2):
LET
vh = ^(v),
vp = perpR(vh)
IN
orthonormal?(vh, vp)
orthogonal_basis_sqv: LEMMA
orthogonal?(e1,e2) AND
w = a1*e1 + a2*e2 IMPLIES
sqv(w) = sq(a1)*sqv(e1) + sq(a2)*sqv(e2)
orthonormal_basis_sqv: LEMMA
orthonormal?(e1,e2) AND
w = a1*e1 + a2*e2 IMPLIES
sqv(w) = sq(a1) + sq(a2)
orthogonal_basis_norm: LEMMA
orthogonal?(e1,e2) AND
w = a1*e1 + a2*e2 IMPLIES
norm(w) = sqrt(sq(a1)*sqv(e1) + sq(a2)*sqv(e2))
orthonormal_basis_norm: LEMMA
orthonormal?(e1,e2) AND
w = a1*e1 + a2*e2 IMPLIES
norm(w) = sqrt(sq(a1) + sq(a2))
orthogonal_basis_norm_ge: LEMMA
orthogonal?(e1,e2) AND
w = a1*e1 + a2*e2 IMPLIES
norm(w) >= abs(a1)*norm(e1)
orthonormal_basis_norm_ge: LEMMA
orthonormal?(e1,e2) AND
w = a1*e1 + a2*e2 IMPLIES
norm(w) >= abs(a1)
orthogonal_basis_dot: LEMMA
orthogonal?(e1,e2) AND
w1 = a1*e1 + a2*e2 AND
w2 = b1*e1 + b2*e2 IMPLIES
w1*w2 = (a1*b1)*sqv(e1) + (a2*b2)*sqv(e2)
orthonormal_basis_dot: LEMMA
orthonormal?(e1,e2) AND
w1 = a1*e1 + a2*e2 AND
w2 = b1*e1 + b2*e2 IMPLIES
w1*w2 = a1*b1 + a2*b2
END basis_2D
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