| Scientific experiment. (1, p. 133) |
| Independent and dependent variables. (4, p. 142) |
| Scientific cognition. (D, p. 182) |
| The language of mathematics. (F, p. 7) |
| Mathematical homology. (C, p. 455) |
| Boolean algebra (A, pp. 94-95) |
| Mathematico-deductive approach. (4, pp. 126-127) |
| Mathematical expression for amount of information. (F, p. 6) |
| Legitimate use of tools. (3, pp. 59, 364) |