let X be set ; for r being Real
for RNS being RealNormSpace
for CNS being ComplexNormSpace
for f being PartFunc of CNS,RNS st f is_uniformly_continuous_on X holds
r (#) f is_uniformly_continuous_on X
let r be Real; for RNS being RealNormSpace
for CNS being ComplexNormSpace
for f being PartFunc of CNS,RNS st f is_uniformly_continuous_on X holds
r (#) f is_uniformly_continuous_on X
let RNS be RealNormSpace; for CNS being ComplexNormSpace
for f being PartFunc of CNS,RNS st f is_uniformly_continuous_on X holds
r (#) f is_uniformly_continuous_on X
let CNS be ComplexNormSpace; for f being PartFunc of CNS,RNS st f is_uniformly_continuous_on X holds
r (#) f is_uniformly_continuous_on X
let f be PartFunc of CNS,RNS; ( f is_uniformly_continuous_on X implies r (#) f is_uniformly_continuous_on X )
assume A1:
f is_uniformly_continuous_on X
; r (#) f is_uniformly_continuous_on X
then
X c= dom f
;
hence A2:
X c= dom (r (#) f)
by VFUNCT_1:def 4; NCFCONT2:def 2 for r being Real st 0 < r holds
ex s being Real st
( 0 < s & ( for x1, x2 being Point of CNS st x1 in X & x2 in X & ||.(x1 - x2).|| < s holds
||.(((r (#) f) /. x1) - ((r (#) f) /. x2)).|| < r ) )
now for p being Real st 0 < p holds
ex s being Real st
( 0 < s & ( for x1, x2 being Point of CNS st x1 in X & x2 in X & ||.(x1 - x2).|| < s holds
||.(((r (#) f) /. x1) - ((r (#) f) /. x2)).|| < p ) )per cases
( r = 0 or r <> 0 )
;
suppose A3:
r = 0
;
for p being Real st 0 < p holds
ex s being Real st
( 0 < s & ( for x1, x2 being Point of CNS st x1 in X & x2 in X & ||.(x1 - x2).|| < s holds
||.(((r (#) f) /. x1) - ((r (#) f) /. x2)).|| < p ) )let p be
Real;
( 0 < p implies ex s being Real st
( 0 < s & ( for x1, x2 being Point of CNS st x1 in X & x2 in X & ||.(x1 - x2).|| < s holds
||.(((r (#) f) /. x1) - ((r (#) f) /. x2)).|| < p ) ) )assume A4:
0 < p
;
ex s being Real st
( 0 < s & ( for x1, x2 being Point of CNS st x1 in X & x2 in X & ||.(x1 - x2).|| < s holds
||.(((r (#) f) /. x1) - ((r (#) f) /. x2)).|| < p ) )then consider s being
Real such that A5:
0 < s
and
for
x1,
x2 being
Point of
CNS st
x1 in X &
x2 in X &
||.(x1 - x2).|| < s holds
||.((f /. x1) - (f /. x2)).|| < p
by A1;
take s =
s;
( 0 < s & ( for x1, x2 being Point of CNS st x1 in X & x2 in X & ||.(x1 - x2).|| < s holds
||.(((r (#) f) /. x1) - ((r (#) f) /. x2)).|| < p ) )thus
0 < s
by A5;
for x1, x2 being Point of CNS st x1 in X & x2 in X & ||.(x1 - x2).|| < s holds
||.(((r (#) f) /. x1) - ((r (#) f) /. x2)).|| < plet x1,
x2 be
Point of
CNS;
( x1 in X & x2 in X & ||.(x1 - x2).|| < s implies ||.(((r (#) f) /. x1) - ((r (#) f) /. x2)).|| < p )assume that A6:
x1 in X
and A7:
x2 in X
and
||.(x1 - x2).|| < s
;
||.(((r (#) f) /. x1) - ((r (#) f) /. x2)).|| < p||.(((r (#) f) /. x1) - ((r (#) f) /. x2)).|| =
||.((r * (f /. x1)) - ((r (#) f) /. x2)).||
by A2, A6, VFUNCT_1:def 4
.=
||.((0. RNS) - ((r (#) f) /. x2)).||
by A3, RLVECT_1:10
.=
||.((0. RNS) - (r * (f /. x2))).||
by A2, A7, VFUNCT_1:def 4
.=
||.((0. RNS) - (0. RNS)).||
by A3, RLVECT_1:10
.=
||.(0. RNS).||
by RLVECT_1:13
.=
0
by NORMSP_0:def 6
;
hence
||.(((r (#) f) /. x1) - ((r (#) f) /. x2)).|| < p
by A4;
verum end; suppose A8:
r <> 0
;
for p being Real st 0 < p holds
ex s being Real st
( 0 < s & ( for x1, x2 being Point of CNS st x1 in X & x2 in X & ||.(x1 - x2).|| < s holds
||.(((r (#) f) /. x1) - ((r (#) f) /. x2)).|| < p ) )let p be
Real;
( 0 < p implies ex s being Real st
( 0 < s & ( for x1, x2 being Point of CNS st x1 in X & x2 in X & ||.(x1 - x2).|| < s holds
||.(((r (#) f) /. x1) - ((r (#) f) /. x2)).|| < p ) ) )A9:
0 < |.r.|
by A8, COMPLEX1:47;
assume
0 < p
;
ex s being Real st
( 0 < s & ( for x1, x2 being Point of CNS st x1 in X & x2 in X & ||.(x1 - x2).|| < s holds
||.(((r (#) f) /. x1) - ((r (#) f) /. x2)).|| < p ) )then
0 < p / |.r.|
by A9;
then consider s being
Real such that A10:
0 < s
and A11:
for
x1,
x2 being
Point of
CNS st
x1 in X &
x2 in X &
||.(x1 - x2).|| < s holds
||.((f /. x1) - (f /. x2)).|| < p / |.r.|
by A1;
take s =
s;
( 0 < s & ( for x1, x2 being Point of CNS st x1 in X & x2 in X & ||.(x1 - x2).|| < s holds
||.(((r (#) f) /. x1) - ((r (#) f) /. x2)).|| < p ) )thus
0 < s
by A10;
for x1, x2 being Point of CNS st x1 in X & x2 in X & ||.(x1 - x2).|| < s holds
||.(((r (#) f) /. x1) - ((r (#) f) /. x2)).|| < plet x1,
x2 be
Point of
CNS;
( x1 in X & x2 in X & ||.(x1 - x2).|| < s implies ||.(((r (#) f) /. x1) - ((r (#) f) /. x2)).|| < p )assume that A12:
x1 in X
and A13:
x2 in X
and A14:
||.(x1 - x2).|| < s
;
||.(((r (#) f) /. x1) - ((r (#) f) /. x2)).|| < pA15:
||.(((r (#) f) /. x1) - ((r (#) f) /. x2)).|| =
||.((r * (f /. x1)) - ((r (#) f) /. x2)).||
by A2, A12, VFUNCT_1:def 4
.=
||.((r * (f /. x1)) - (r * (f /. x2))).||
by A2, A13, VFUNCT_1:def 4
.=
||.(r * ((f /. x1) - (f /. x2))).||
by RLVECT_1:34
.=
|.r.| * ||.((f /. x1) - (f /. x2)).||
by NORMSP_1:def 1
;
|.r.| * ||.((f /. x1) - (f /. x2)).|| < (p / |.r.|) * |.r.|
by A9, A11, A12, A13, A14, XREAL_1:68;
hence
||.(((r (#) f) /. x1) - ((r (#) f) /. x2)).|| < p
by A9, A15, XCMPLX_1:87;
verum end; end; end;
hence
for r being Real st 0 < r holds
ex s being Real st
( 0 < s & ( for x1, x2 being Point of CNS st x1 in X & x2 in X & ||.(x1 - x2).|| < s holds
||.(((r (#) f) /. x1) - ((r (#) f) /. x2)).|| < r ) )
; verum