| Subject | English | Russian |
| math. | necessary and sufficient | необходимый и достаточный (In logic, necessity and sufficiency refer to the implicational relationships between statements. The assertion that one statement is a necessary and sufficient condition of another means that the former statement is true if and only if the latter is true. Wiki. Thus, the most crucial task in the design of an intermittent mechanism is how to produce the dwell time necessary and sufficient to accommodate the completion of a prescribed series of operations. Klimzo Alexander Demidov) |
| phys. | necessary and sufficient | необходимо и достаточно |
| math. | necessary and sufficient condition | необходимое и достаточное условие (condition that without which nothing will happen and upon whose fulfillment there is no need for any other conditions (Logic). BED • a necessary and sufficient condition for the eradication of unemployment. OCD Alexander Demidov) |
| phys. | necessary and sufficient condition | необходимое и достаточное условие |
| tech. | necessary and sufficient conditions | необходимые и достаточные условия |
| math. | necessary and sufficient criterion | необходимый и достаточный критерий |
| math. | necessary and sufficient criterion | необходимое и достаточное условие |
| math. | is necessary and sufficient for | необходимый и достаточный для |
| gen. | to the extent necessary and sufficient | в количестве, необходимом и достаточном (To the extent necessary and sufficient for making the payments secured by any pledge of pledged funds made pursuant to the provisions of this chapter, such ... АД Alexander Demidov) |
| gen. | to the extent necessary and sufficient for | в количестве, необходимом и достаточном для (Alexander Demidov) |