"In this paper we discuss a problem mentioned by Eliashberg in his paper [3]. He has asked if two completed Weinstein structures (X, λ ˆ0, φ0) and (X, λ ˆ1, φ1) on the same symplectic manifold (X, ωˆ) can be homotoped through Weinstein structures."
Verb Tenses in Academic Writing

Quiz
•
English, Mathematics
•
University
•
Hard
Erick Tristão
Used 57+ times
FREE Resource
15 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
This is the simple present.
This is the simple past.
This is the present perfect.
This is the past perfect.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
"On Weinstein cobordisms a similar result has been proved in [7] although the Weinstein structures need to flexible."
This is the simple present.
This is the simple past.
This is the present perfect.
This is the past perfect.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
"The notations of recurrent, rigid and uniformly rigid operators were introduced and systematically investigated by G. Costakis, I. Parissis and A. Manoussos (cf. [5]–[6])."
This is the simple present.
This is the simple past.
This is the present perfect.
This is the past perfect.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
"... here, we are going to give some answers concerning this questions for C0-semigroups of operators."
This is a present form.
This is a past form.
This is a future form.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
"This concept, in the context of topological dynamical systems, is known as the (uniform) rigidity, which was introduced by S. Glasner and D. Maon (see [14], [10] and [11])."
This is the simple present.
This is the simple past.
This is the present perfect.
This is the past perfect.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
"We will always assume that the sequences (kn) n∈N in the previous definitions satisfy lim n→+∞ kn = +∞."
This is a present form.
This is a past form.
This is a future form.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
"It has been studied by many authors (see [2], [3], [12], [16], [17], [18] and [19])."
This is the simple present.
This is the simple past.
This is the present perfect.
This is the past perfect.
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