| 1 | The belief that one is not wise is not a sufficient condition for wisdom. | |
| 2 | Your smile affirmation, is I exist in this the sufficient and necessary conditions. | |
| 3 | The controllability of singular control systems with delay is studied, then some necessary and sufficient conditions are given. | |
| 4 | In this note, we give necessary and sufficient conditions under which there is a unique Jordan frame in a Euclidean Jordan algebra. | |
| 5 | Second, the necessary and sufficient condition for capital market to arrive at post-Pareto optimality is strong information symmetry. |
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