existence theorem


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existence theorem

[ig′zis·təns ‚thir·əm]
(mathematics)
The theorem that at least one object of a specified type exists.
References in periodicals archive ?
In [13], we discussed the existence theorem of weak solutions nonlinear fractional integrodifferential equations in nonreflexive Banach spaces E:
By slightly modifying the proof of Theorem 3, we can apply Lemma 2 to obtain an existence theorem to (2) when condition (H) is replaced by (G) and either (8) with -1 < [beta] < 0 or (9) with [beta] = 0 is satisfied, which has been established in [20] for the case [x.sub.0] = 0 when (9) with [beta] = 0 is satisfied and in [9] for the case [x.sub.0] = 0 when (8) with [beta] = -1 is satisfied.
Wattis, "Existence theorem for solitary waves on lattices," Communications in Mathematical Physics, vol.
We first utilize the Guo-Krasnosel'skii fixed point theorem to obtain two positive solutions existence theorems when f grows (p - 1)-superlinearly and (p - 1)-sublinearly with the p-Laplacian, and secondly by using the fixed point index, we obtain a nontrivial solution existence theorem without the p-Laplacian, but the nonlinearity can allow being sign-changing and unbounded from below.
Ntouyas, "An existence theorem for fractional hybrid differential inclusions of Hadamard type with Dirichlet boundary conditions," Abstract and Applied Analysis, vol.
Based on the regularity estimates for the semigroups and the classical existence theorem of global attractors, we prove that the system possesses a global attractor in the space [H.sub.k+1/4] x [H.sub.kk+3/4].
PARK, JKMS 29 (1992) [22]--We apply our existence theorem to obtain new coincidence, fixed point, and surjectivity theorems, and existence theorems on critical points for a larger class of multifunctions than upper hemicontinuous ones defined on convex sets.
Even today, Tonelli's theorem remains the central existence theorem for dynamic problems, although the hypotheses of the theorem can be relaxed: see, for example, [12].
Lecko, An existence theorem for a class of infinite systems of integral equations, Math.
In contrast to Part 1, Part 2 is devoted to the proof of a global existence theorem for another particular case of (gCLM) equation.
It is based on the linearization properties of measure and has many advantages like automatic existence theorem, converting even the strong no-linear problems into a linear, a known method for determining optimal control as a piece wise constant function.
Existence theorem of a super quasi-Einstein manifold