I believe they mean that the random variables have a common support. For example, if X ~ Unif[0,2] and Y ~ Unif[1,3], then their respective PDF's overlap in the interval [1,2], meaning the only interval where both X and Y can have common values is [1,2]. To illustrate, below is a representation of the supports of X and Y, below which is a representation of the real line.
1 Thyroid cancer is a malignant tumor of the thyroid gland. 2  Symptoms of thyroid cancer include swelling in the neck (goiter), neck pain, hoarseness, swallowing and breathing problem, swollen lymph gland in the neck.
Glandular fever comes on gradually. It begins with flu-like symptoms; fever, headache and a general malaise and lethargy. After a few days, the lymph glands begin to swell, although this symptom is not noticeable in everyone. Swollen glands in the back of the neck are especially typical of glandular fever.Most people develop a sore throat, which can be very severe, with inflamed tonsils. A fever, usually no higher than 40 degrees Celsius (104 degrees Fahrenheit), can also develop and may last up to three weeks.wollen glands in the back of the neck are especially typical of glandular fever. Most people develop a sore throat, which can be very severe, with inflamed tonsils. A fever, usually no higher than 40 degrees Celsius (104 degrees Fahrenheit), can also develop and may last up to three weeks.