Sentence examples for a main difficulty is that from inspiring English sources

A main difficulty is that they generally include time differentiated versions of known signals which are difficult to estimate in a noisy environment.

Turning now to difficulties with CDQ, a main difficulty is that it isn't clear whether the use of the notion of familiarity in the account of conditional donkey sentences can be ultimately upheld.

The main difficulty is that, a sliding mode surface cannot be designed based on the unknown transition rate and unmeasurable state directly.

(3) Concerning the local martingale analogue of Proposition 2.8, the main difficulty is that a local ((mathbb {G},mathbb {P} -martingale need not be localized by a sequence of (mathbb {P} -martingalemes.

The main difficulty is that this equation presents a singularity for small relative velocities.

The main difficulty is that the production lacks a coherent vision".

We give conditions under which there is a unique fixed point depending differentiably on the parameters; the main difficulty is that the mappings under consideration become only differentiable after composition with appropriate embeddings on the scale of Banach spaces.

The main difficulty is that the control on M is a weak control on m while the nonlinear term, which involves N ( t ), is in a strong dependency.

The main difficulty is that the huge number of markers in a metagenome-wide association study prevents the exhaustive search of combinations of microbial markers, and the continuous form of such markers prevents the application of highly efficient computational tricks such as bit-wise operations that have been adopted in existing methods in genome-wide studies.

The main difficulty is that there are two syllables in people and only one in Queen.

The main difficulty is that the Saudis themselves feel vulnerable to the Islamic fundamentalists.